diff --git a/Cargo.lock b/Cargo.lock
index c952630..3fd68d8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,7 +3,7 @@ name = "MacTypes-sys"
 version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -55,8 +55,8 @@ dependencies = [
  "autocfg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -66,7 +66,7 @@ version = "0.1.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -103,7 +103,7 @@ dependencies = [
  "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "chashmap 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "data-encoding 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "data-encoding 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "derive_more 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "diesel 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "diesel_migrations 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -125,11 +125,11 @@ dependencies = [
  "rmpv 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket_contrib 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "syslog 4.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "u2f 0.1.2 (git+https://github.com/wisespace-io/u2f-rs?rev=75b9fa5afb4c5)",
+ "u2f 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "uuid 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ws 0.7.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "yubico 0.4.0 (git+https://github.com/dani-garcia/yubico-rs)",
@@ -232,7 +232,7 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -240,7 +240,7 @@ name = "core-foundation-sys"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -292,7 +292,7 @@ dependencies = [
 
 [[package]]
 name = "data-encoding"
-version = "2.1.1"
+version = "2.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -388,7 +388,7 @@ name = "dotenv"
 version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -487,16 +487,16 @@ dependencies = [
 
 [[package]]
 name = "failure"
-version = "0.1.3"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "failure_derive"
-version = "0.1.3"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -533,8 +533,8 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -562,7 +562,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fsevent-sys 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -570,7 +570,7 @@ name = "fsevent-sys"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -652,7 +652,7 @@ name = "hostname"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "winutil 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -761,7 +761,7 @@ dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "inotify-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -772,7 +772,7 @@ name = "inotify-sys"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -780,7 +780,7 @@ name = "iovec"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -805,8 +805,8 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -823,9 +823,9 @@ dependencies = [
  "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "ring 0.13.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -860,16 +860,16 @@ source = "git+https://github.com/lettre/lettre?rev=c988b1760ad81#c988b1760ad8179
 dependencies = [
  "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "bufstream 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "fast_chemail 0.9.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "hostname 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "native-tls 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "nom 4.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -879,8 +879,8 @@ source = "git+https://github.com/lettre/lettre?rev=c988b1760ad81#c988b1760ad8179
 dependencies = [
  "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "email 0.0.19 (git+https://github.com/lettre/rust-email)",
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "lettre 0.9.0 (git+https://github.com/lettre/lettre?rev=c988b1760ad81)",
  "mime 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -889,7 +889,7 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.45"
+version = "0.2.46"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -948,7 +948,7 @@ version = "2.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1023,7 +1023,7 @@ dependencies = [
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1048,7 +1048,7 @@ version = "0.6.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1104,7 +1104,7 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl 0.10.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1121,7 +1121,7 @@ version = "0.2.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1168,7 +1168,7 @@ dependencies = [
  "fsevent-sys 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "inotify 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio-extras 2.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1212,7 +1212,7 @@ name = "num_cpus"
 version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1236,7 +1236,7 @@ dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-sys 0.9.40 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1251,7 +1251,7 @@ version = "0.9.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1293,7 +1293,7 @@ name = "parking_lot_core"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1304,7 +1304,7 @@ name = "parking_lot_core"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1442,7 +1442,7 @@ version = "0.3.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1452,7 +1452,7 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1463,7 +1463,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1475,7 +1475,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_chacha 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1543,7 +1543,7 @@ dependencies = [
 
 [[package]]
 name = "redox_syscall"
-version = "0.1.45"
+version = "0.1.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1591,8 +1591,8 @@ dependencies = [
  "mime 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime_guess 2.0.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "native-tls 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_urlencoded 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1607,7 +1607,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1670,8 +1670,8 @@ dependencies = [
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "notify 4.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1698,7 +1698,7 @@ version = "0.2.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "gcc 0.3.55 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1706,7 +1706,7 @@ dependencies = [
 
 [[package]]
 name = "rustc-demangle"
-version = "0.1.11"
+version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1801,7 +1801,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "core-foundation 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "security-framework-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1812,7 +1812,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "MacTypes-sys 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1830,12 +1830,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.83"
+version = "1.0.84"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde_derive"
-version = "1.0.83"
+version = "1.0.84"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1845,12 +1845,12 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.33"
+version = "1.0.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1860,7 +1860,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "dtoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1981,7 +1981,7 @@ version = "4.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2001,9 +2001,9 @@ version = "3.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2013,8 +2013,8 @@ name = "thread-id"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2039,8 +2039,8 @@ name = "time"
 version = "0.1.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2203,7 +2203,7 @@ dependencies = [
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  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
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  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2217,7 +2217,7 @@ name = "toml"
 version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2258,17 +2258,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
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-version = "0.1.2"
-source = "git+https://github.com/wisespace-io/u2f-rs?rev=75b9fa5afb4c5#75b9fa5afb4c5230255136b6689df2a359f41472"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
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  "webpki 0.18.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2545,7 +2545,7 @@ dependencies = [
 "checksum crossbeam-epoch 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f10a4f8f409aaac4b16a5474fb233624238fcdeefb9ba50d5ea059aab63ba31c"
 "checksum crossbeam-utils 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "41ee4864f4797060e52044376f7d107429ce1fb43460021b126424b7180ee21a"
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-"checksum data-encoding 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "67df0571a74bf0d97fb8b2ed22abdd9a48475c96bd327db968b7d9cace99655e"
+"checksum data-encoding 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f4f47ca1860a761136924ddd2422ba77b2ea54fe8cc75b9040804a0d9d32ad97"
 "checksum derive_more 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3f57d78cf3bd45270dad4e70c21ec77a960b36c7a841ff9db76aaa775a8fb871"
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 "checksum devise_codegen 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "066ceb7928ca93a9bedc6d0e612a8a0424048b0ab1f75971b203d01420c055d7"
@@ -2567,8 +2567,8 @@ dependencies = [
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 "checksum error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ff511d5dc435d703f4971bc399647c9bc38e20cb41452e3b9feb4765419ed3f3"
-"checksum failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6dd377bcc1b1b7ce911967e3ec24fa19c3224394ec05b54aa7b083d498341ac7"
-"checksum failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "64c2d913fe8ed3b6c6518eedf4538255b989945c14c2a7d5cbff62a5e2120596"
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+"checksum failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "ea1063915fd7ef4309e222a5a07cf9c319fb9c7836b1f89b85458672dbb127e1"
 "checksum fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 "checksum fast_chemail 0.9.5 (registry+https://github.com/rust-lang/crates.io-index)" = "115e1df89e36c3300a0f88b8b81c41ad24f7bf2b291912e405824d98a553704b"
 "checksum fern 0.5.7 (registry+https://github.com/rust-lang/crates.io-index)" = "b48af88aaf938b11baef948a5599e66e709cf92854aa2b87c71f1bcf20f80a01"
@@ -2609,7 +2609,7 @@ dependencies = [
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 "checksum lettre 0.9.0 (git+https://github.com/lettre/lettre?rev=c988b1760ad81)" = "<none>"
 "checksum lettre_email 0.9.0 (git+https://github.com/lettre/lettre?rev=c988b1760ad81)" = "<none>"
-"checksum libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)" = "2d2857ec59fadc0773853c664d2d18e7198e83883e7060b63c924cb077bd5c74"
+"checksum libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)" = "023a4cd09b2ff695f9734c1934145a315594b7986398496841c7031a5a1bbdbd"
 "checksum libflate 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)" = "bff3ac7d6f23730d3b533c35ed75eef638167634476a499feef16c428d74b57b"
 "checksum libsqlite3-sys 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "d3711dfd91a1081d2458ad2d06ea30a8755256e74038be2ad927d94e1c955ca8"
 "checksum lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "62ebf1391f6acad60e5c8b43706dde4582df75c06698ab44511d15016bc2442c"
@@ -2679,7 +2679,7 @@ dependencies = [
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 "checksum rand_pcg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "086bd09a33c7044e56bb44d5bdde5a60e7f119a9e95b0775f545de759a32fe05"
 "checksum rand_xorshift 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "effa3fcaa47e18db002bdde6060944b6d2f9cfd8db471c30e873448ad9187be3"
-"checksum redox_syscall 0.1.45 (registry+https://github.com/rust-lang/crates.io-index)" = "7b7aac97a11cf928b13c97f726b1bfe8542969fcbc39007ce566a888da5964a3"
+"checksum redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)" = "52ee9a534dc1301776eff45b4fa92d2c39b1d8c3d3357e6eb593e0d795506fc2"
 "checksum regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "37e7cbbd370869ce2e8dff25c7018702d10b21a20ef7135316f8daecd6c25b7f"
 "checksum regex-syntax 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4e47a2ed29da7a9e1960e1639e7a982e6edc6d49be308a3b02daf511504a16d1"
 "checksum remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3488ba1b9a2084d38645c4c08276a1752dcbf2c7130d74f1569681ad5d2799c5"
@@ -2692,7 +2692,7 @@ dependencies = [
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 "checksum rocket_http 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ba9d4f2ce5bba6e1b6d3100493bbad63879e99bbf6b4365d61e6f781daab324d"
 "checksum rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)" = "f76d05d3993fd5f4af9434e8e436db163a12a9d40e1a58a726f27a01dfd12a2a"
-"checksum rustc-demangle 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "01b90379b8664dd83460d59bdc5dd1fd3172b8913788db483ed1325171eab2f7"
+"checksum rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "adacaae16d02b6ec37fdc7acfcddf365978de76d1983d3ee22afc260e1ca9619"
 "checksum rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0ceb8ce7a5e520de349e1fa172baeba4a9e8d5ef06c47471863530bc4972ee1e"
 "checksum rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)" = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
 "checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
@@ -2709,9 +2709,9 @@ dependencies = [
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+"checksum serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)" = "bdf540260cfee6da923831f4776ddc495ada940c30117977c70f1313a6130545"
 "checksum serde_urlencoded 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d48f9f99cd749a2de71d29da5f948de7f2764cc5a9d7f3c97e3514d4ee6eabf2"
 "checksum sha-1 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8347606816471548cd60f0abd5ef0d513a81f5202dbdab9c09f17a15b5248484"
 "checksum sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2579985fda508104f7587689507983eadd6a6e84dd35d6d115361f530916fa0d"
@@ -2754,7 +2754,7 @@ dependencies = [
 "checksum typeable 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1410f6f91f21d1612654e7cc69193b0334f909dcf2c790c4826254fbb86f8887"
 "checksum typemap 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "653be63c80a3296da5551e1bfd2cca35227e13cdd08c6668903ae2f4f77aa1f6"
 "checksum typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "612d636f949607bdf9b123b4a6f6d966dedf3ff669f7f045890d3a4a73948169"
-"checksum u2f 0.1.2 (git+https://github.com/wisespace-io/u2f-rs?rev=75b9fa5afb4c5)" = "<none>"
+"checksum u2f 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "3c74b68bd3f67273d9d3161dbab8672a69df832a7fbcd1e2cd9b714063648ab5"
 "checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
 "checksum unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7f4765f83163b74f957c797ad9253caf97f103fb064d3999aea9568d09fc8a33"
 "checksum unicase 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9d3218ea14b4edcaccfa0df0a64a3792a2c32cc706f1b336e48867f9d3147f90"
diff --git a/Cargo.toml b/Cargo.toml
index 5a90780..7f7947e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,9 +34,9 @@ rmpv = "0.4.0"
 chashmap = "2.2.0"
 
 # A generic serialization/deserialization framework
-serde = "1.0.83"
-serde_derive = "1.0.83"
-serde_json = "1.0.33"
+serde = "1.0.84"
+serde_derive = "1.0.84"
+serde_json = "1.0.34"
 
 # Logging
 log = "0.4.6"
@@ -63,13 +63,13 @@ chrono = "0.4.6"
 oath = "0.10.2"
 
 # Data encoding library
-data-encoding = "2.1.1"
+data-encoding = "2.1.2"
 
 # JWT library
 jsonwebtoken = "5.0.1"
 
 # U2F library
-u2f = "0.1.2"
+u2f = "0.1.4"
 
 # Yubico Library
 yubico = { version = "=0.4.0", features = ["online"], default-features = false }
@@ -103,8 +103,5 @@ rmp = { git = 'https://github.com/dani-garcia/msgpack-rust' }
 lettre = { git = 'https://github.com/lettre/lettre', rev = 'c988b1760ad81' }
 lettre_email = { git = 'https://github.com/lettre/lettre', rev = 'c988b1760ad81' }
 
-# Version 0.1.2 from crates.io lacks a commit that fixes a certificate error
-u2f = { git = 'https://github.com/wisespace-io/u2f-rs', rev = '75b9fa5afb4c5' }
-
 # Allows optional libusb support
 yubico = { git = 'https://github.com/dani-garcia/yubico-rs' }
diff --git a/src/api/core/accounts.rs b/src/api/core/accounts.rs
index 556d15e..9db46a0 100644
--- a/src/api/core/accounts.rs
+++ b/src/api/core/accounts.rs
@@ -78,7 +78,7 @@ fn register(data: JsonUpcase<RegisterData>, conn: DbConn) -> EmptyResult {
                     };
 
                     let claims: InviteJWTClaims = decode_invite_jwt(&token)?;
-                    if &claims.email == &data.Email {
+                    if claims.email == data.Email {
                         user
                     } else {
                         err!("Registration email does not match invite email")
diff --git a/src/api/core/two_factor.rs b/src/api/core/two_factor.rs
index a2f2cd4..dfe2d51 100644
--- a/src/api/core/two_factor.rs
+++ b/src/api/core/two_factor.rs
@@ -287,23 +287,22 @@ struct EnableU2FData {
 }
 
 // This struct is copied from the U2F lib
-// because challenge is not always sent
+// to add an optional error code
 #[derive(Deserialize)]
 #[serde(rename_all = "camelCase")]
 struct RegisterResponseCopy {
     pub registration_data: String,
     pub version: String,
-    pub challenge: Option<String>,
-    pub error_code: Option<NumberOrString>,
     pub client_data: String,
+    
+    pub error_code: Option<NumberOrString>,
 }
 
 impl RegisterResponseCopy {
-    fn into_response(self, challenge: String) -> RegisterResponse {
+    fn into_response(self) -> RegisterResponse {
         RegisterResponse {
             registration_data: self.registration_data,
             version: self.version,
-            challenge,
             client_data: self.client_data,
         }
     }
@@ -336,7 +335,7 @@ fn activate_u2f(data: JsonUpcase<EnableU2FData>, headers: Headers, conn: DbConn)
             err!("Error registering U2F token")
         }
 
-        let response = response_copy.into_response(challenge.challenge.clone());
+        let response = response_copy.into_response();
 
         let registration = U2F.register_response(challenge.clone(), response)?;
         // TODO: Allow more than one U2F device
diff --git a/src/api/web.rs b/src/api/web.rs
index d838ba2..4ab5ec3 100644
--- a/src/api/web.rs
+++ b/src/api/web.rs
@@ -68,12 +68,12 @@ struct Cached<R>(R, &'static str);
 impl<R> Cached<R> {
     fn long(r: R) -> Cached<R> {
         // 7 days
-        Cached(r, "public, max-age=604800".into())
+        Cached(r, "public, max-age=604800")
     }
 
     fn short(r: R) -> Cached<R> {
         // 10 minutes
-        Cached(r, "public, max-age=600".into())
+        Cached(r, "public, max-age=600")
     }
 }
 
diff --git a/src/error.rs b/src/error.rs
index 8bb1905..115ef0e 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -76,17 +76,17 @@ impl Error {
     }
 }
 
-pub trait MapResult<S, E> {
-    fn map_res(self, msg: &str) -> Result<S, E>;
+pub trait MapResult<S> {
+    fn map_res(self, msg: &str) -> Result<S, Error>;
 }
 
-impl<S, E: Into<Error>> MapResult<S, Error> for Result<S, E> {
+impl<S, E: Into<Error>> MapResult<S> for Result<S, E> {
     fn map_res(self, msg: &str) -> Result<S, Error> {
         self.map_err(|e| e.into().with_msg(msg))
     }
 }
 
-impl<E: Into<Error>> MapResult<(), Error> for Result<usize, E> {
+impl<E: Into<Error>> MapResult<()> for Result<usize, E> {
     fn map_res(self, msg: &str) -> Result<(), Error> {
         self.and(Ok(())).map_res(msg)
     }
diff --git a/src/main.rs b/src/main.rs
index 14408ce..1ffc59c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -332,9 +332,9 @@ impl Config {
             attachments_folder: get_env_or("ATTACHMENTS_FOLDER", format!("{}/{}", &df, "attachments")),
 
             // icon_cache_ttl defaults to 30 days (30 * 24 * 60 * 60 seconds)
-            icon_cache_ttl: get_env_or("ICON_CACHE_TTL", 2592000u64),
+            icon_cache_ttl: get_env_or("ICON_CACHE_TTL", 2_592_000),
             // icon_cache_negttl defaults to 3 days (3 * 24 * 60 * 60 seconds)
-            icon_cache_negttl: get_env_or("ICON_CACHE_NEGTTL", 259200u64),
+            icon_cache_negttl: get_env_or("ICON_CACHE_NEGTTL", 259_200),
 
             private_rsa_key: format!("{}.der", &key),
             private_rsa_key_pem: format!("{}.pem", &key),