Add missing requires

mailer.js

@@ -4,7 +4,7 @@
 
 var assert = require('assert'),
     debug = require('debug')('e2e:mailer'),
-    postmark = require('postmark')(config.postmarkApiKey()),
+    postmark = require('postmark')(process.env.POSTMARK_API_KEY),
     util = require('util');
 
 exports = module.exports = {

package.json

@@ -14,16 +14,19 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "async": "^1.4.0",
     "colors": "^1.1.0",
     "debug": "^2.2.0",
     "mocha": "^2.2.5",
     "once": "^1.3.2",
     "parallel-mocha": "0.0.7",
+    "postmark": "^1.0.0",
     "readline-sync": "^1.2.19",
     "semver": "^4.3.6",
     "should": "^6.0.3",
     "sleep": "^2.0.0",
     "stripe": "^3.5.0",
+    "superagent": "^1.2.0",
     "superagent-sync": "^0.1.0",
     "supererror": "^0.7.0"
   }