add reveal animation to settings button

org.fox.ttrss/src/main/java/org/fox/ttrss/BaseFeedlistFragment.java

@@ -3,6 +3,8 @@ package org.fox.ttrss;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.net.Uri;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.app.ActivityOptionsCompat;
 import android.support.v4.app.Fragment;
 import android.support.v7.widget.SwitchCompat;
 import android.util.TypedValue;
@@ -51,7 +53,12 @@ public abstract class BaseFeedlistFragment extends Fragment {
                             try {
                                 Intent intent = new Intent(getActivity(),
                                         PreferencesActivity.class);
-                                startActivityForResult(intent, 0);
+
+                                ActivityOptionsCompat options = ActivityOptionsCompat
+                                        .makeSceneTransitionAnimation(getActivity(), v, "SETTINGS_REVEAL");
+
+                                ActivityCompat.startActivityForResult(getActivity(), intent, 0, options.toBundle());
+
                             } catch (Exception e) {
 
                             }

org.fox.ttrss/src/main/res/layout/activity_preferences.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
+    android:transitionName="SETTINGS_REVEAL"
     android:fitsSystemWindows="true"
     android:layout_width="match_parent"
     android:layout_height="match_parent">

org.fox.ttrss/src/main/res/layout/drawer_header.xml

@@ -28,6 +28,7 @@
             android:clickable="true"
             android:layout_marginBottom="16dp"
             android:layout_marginRight="12dp"
+            android:transitionName="SETTINGS_REVEAL"
             android:background="@drawable/ripple" />
 
         <LinearLayout