Update rails to version 4.1.6

Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 ruby '2.1.2'
 
-gem 'rails', '~> 4.1.5'
+gem 'rails', '~> 4.1.6'
 
 gem 'arel'
 gem 'devise'

Gemfile.lock

@@ -1,27 +1,27 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actionmailer (4.1.5)
-      actionpack (= 4.1.5)
-      actionview (= 4.1.5)
-      mail (~> 2.5.4)
-    actionpack (4.1.5)
-      actionview (= 4.1.5)
-      activesupport (= 4.1.5)
+    actionmailer (4.1.6)
+      actionpack (= 4.1.6)
+      actionview (= 4.1.6)
+      mail (~> 2.5, >= 2.5.4)
+    actionpack (4.1.6)
+      actionview (= 4.1.6)
+      activesupport (= 4.1.6)
       rack (~> 1.5.2)
       rack-test (~> 0.6.2)
-    actionview (4.1.5)
-      activesupport (= 4.1.5)
+    actionview (4.1.6)
+      activesupport (= 4.1.6)
       builder (~> 3.1)
       erubis (~> 2.7.0)
-    activemodel (4.1.5)
-      activesupport (= 4.1.5)
+    activemodel (4.1.6)
+      activesupport (= 4.1.6)
       builder (~> 3.1)
-    activerecord (4.1.5)
-      activemodel (= 4.1.5)
-      activesupport (= 4.1.5)
+    activerecord (4.1.6)
+      activemodel (= 4.1.6)
+      activesupport (= 4.1.6)
       arel (~> 5.0.0)
-    activesupport (4.1.5)
+    activesupport (4.1.6)
       i18n (~> 0.6, >= 0.6.9)
       json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
@@ -78,11 +78,10 @@ GEM
     kaminari (0.16.1)
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
-    mail (2.5.4)
-      mime-types (~> 1.16)
-      treetop (~> 1.4.8)
+    mail (2.6.1)
+      mime-types (>= 1.16, < 3)
     method_source (0.8.2)
-    mime-types (1.25.1)
+    mime-types (2.3)
     mini_portile (0.6.0)
     minitest (5.4.1)
     multi_json (1.10.1)
@@ -95,7 +94,6 @@ GEM
       ast (>= 1.1, < 3.0)
       slop (~> 3.4, >= 3.4.5)
     pg (0.17.1)
-    polyglot (0.3.5)
     powerpack (0.0.9)
     pry (0.10.1)
       coderay (~> 1.1.0)
@@ -109,15 +107,15 @@ GEM
       rack (~> 1.1)
     rack-test (0.6.2)
       rack (>= 1.0)
-    rails (4.1.5)
-      actionmailer (= 4.1.5)
-      actionpack (= 4.1.5)
-      actionview (= 4.1.5)
-      activemodel (= 4.1.5)
-      activerecord (= 4.1.5)
-      activesupport (= 4.1.5)
+    rails (4.1.6)
+      actionmailer (= 4.1.6)
+      actionpack (= 4.1.6)
+      actionview (= 4.1.6)
+      activemodel (= 4.1.6)
+      activerecord (= 4.1.6)
+      activesupport (= 4.1.6)
       bundler (>= 1.3.0, < 2.0)
-      railties (= 4.1.5)
+      railties (= 4.1.6)
       sprockets-rails (~> 2.0)
     rails_12factor (0.0.2)
       rails_serve_static_assets
@@ -138,9 +136,9 @@ GEM
       sass-rails (~> 4.0)
     rails_serve_static_assets (0.0.2)
     rails_stdout_logging (0.0.3)
-    railties (4.1.5)
-      actionpack (= 4.1.5)
-      activesupport (= 4.1.5)
+    railties (4.1.6)
+      actionpack (= 4.1.6)
+      activesupport (= 4.1.6)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rainbow (2.0.0)
@@ -186,9 +184,6 @@ GEM
     thread_safe (0.3.4)
     tilt (1.4.1)
     tins (1.3.2)
-    treetop (1.4.15)
-      polyglot
-      polyglot (>= 0.3.1)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
     uglifier (2.5.3)
@@ -217,7 +212,7 @@ DEPENDENCIES
   pg
   pry
   puma
-  rails (~> 4.1.5)
+  rails (~> 4.1.6)
   rails_12factor
   rails_admin
   rubocop