update rails version

Gemfile

@@ -19,7 +19,7 @@ gem 'coffee-rails'
 gem "therubyracer", :platforms => :ruby
 gem "pry", :group => [:test, :development]
 gem "pry-debugger", :group => [:test, :development]
-gem "rails", "~> 4.1.5"
+gem "rails", "~> 4.1.8"
 gem "pg"
 gem "kgio"
 gem "dalli"

Gemfile.lock

@@ -17,27 +17,27 @@ GIT
 GEM
   remote: https://rubygems.org/
   specs:
-    actionmailer (4.1.5)
+    actionmailer (4.1.8)
-      actionpack (= 4.1.5)
+      actionpack (= 4.1.8)
-      actionview (= 4.1.5)
+      actionview (= 4.1.8)
-      mail (~> 2.5.4)
+      mail (~> 2.5, >= 2.5.4)
-    actionpack (4.1.5)
+    actionpack (4.1.8)
-      actionview (= 4.1.5)
+      actionview (= 4.1.8)
-      activesupport (= 4.1.5)
+      activesupport (= 4.1.8)
       rack (~> 1.5.2)
       rack-test (~> 0.6.2)
-    actionview (4.1.5)
+    actionview (4.1.8)
-      activesupport (= 4.1.5)
+      activesupport (= 4.1.8)
       builder (~> 3.1)
       erubis (~> 2.7.0)
-    activemodel (4.1.5)
+    activemodel (4.1.8)
-      activesupport (= 4.1.5)
+      activesupport (= 4.1.8)
       builder (~> 3.1)
-    activerecord (4.1.5)
+    activerecord (4.1.8)
-      activemodel (= 4.1.5)
+      activemodel (= 4.1.8)
-      activesupport (= 4.1.5)
+      activesupport (= 4.1.8)
       arel (~> 5.0.0)
-    activesupport (4.1.5)
+    activesupport (4.1.8)
       i18n (~> 0.6, >= 0.6.9)
       json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
@@ -116,9 +116,8 @@ GEM
     jwt (1.2.0)
     kgio (2.9.2)
     libv8 (3.16.14.3)
-    mail (2.5.4)
+    mail (2.6.3)
-      mime-types (~> 1.16)
+      mime-types (>= 1.16, < 3)
-      treetop (~> 1.4.8)
     mechanize (2.7.2)
       domain_name (~> 0.5, >= 0.5.1)
       http-cookie (~> 1.0.0)
@@ -132,7 +131,7 @@ GEM
     method_source (0.8.2)
     mime-types (1.25.1)
     mini_portile (0.5.3)
-    minitest (5.4.0)
+    minitest (5.4.3)
     mocha (1.0.0)
       metaclass (~> 0.0.1)
     monetize (0.3.0)
@@ -162,7 +161,6 @@ GEM
       multi_xml (~> 0.5)
       rack (~> 1.2)
     pg (0.17.1)
-    polyglot (0.3.5)
     protected_attributes (1.0.7)
       activemodel (>= 4.0.1, < 5.0)
     pry (0.9.12.6)
@@ -176,23 +174,23 @@ GEM
     rack-test (0.6.2)
       rack (>= 1.0)
     radix62 (1.0.1)
-    rails (4.1.5)
+    rails (4.1.8)
-      actionmailer (= 4.1.5)
+      actionmailer (= 4.1.8)
-      actionpack (= 4.1.5)
+      actionpack (= 4.1.8)
-      actionview (= 4.1.5)
+      actionview (= 4.1.8)
-      activemodel (= 4.1.5)
+      activemodel (= 4.1.8)
-      activerecord (= 4.1.5)
+      activerecord (= 4.1.8)
-      activesupport (= 4.1.5)
+      activesupport (= 4.1.8)
       bundler (>= 1.3.0, < 2.0)
-      railties (= 4.1.5)
+      railties (= 4.1.8)
       sprockets-rails (~> 2.0)
-    railties (4.1.5)
+    railties (4.1.8)
-      actionpack (= 4.1.5)
+      actionpack (= 4.1.8)
-      activesupport (= 4.1.5)
+      activesupport (= 4.1.8)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     raindrops (0.13.0)
-    rake (10.3.2)
+    rake (10.4.2)
     ref (1.0.5)
     rmagick (2.13.3)
     ruby-prof (0.14.2)
@@ -226,10 +224,10 @@ GEM
       multi_json (~> 1.0)
       rack (~> 1.0)
       tilt (~> 1.1, != 1.3.0)
-    sprockets-rails (2.1.3)
+    sprockets-rails (2.2.2)
       actionpack (>= 3.0)
       activesupport (>= 3.0)
-      sprockets (~> 2.8)
+      sprockets (>= 2.8, < 4.0)
     statistics2 (0.54)
     streamio-ffmpeg (1.0.0)
     term-ansicolor (1.3.0)
@@ -242,9 +240,6 @@ GEM
     tilt (1.4.1)
     timecop (0.7.1)
     tins (1.1.0)
-    treetop (1.4.15)
-      polyglot
-      polyglot (>= 0.3.1)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
     uglifier (2.5.0)
@@ -298,7 +293,7 @@ DEPENDENCIES
   pry
   pry-debugger
   radix62 (~> 1.0.1)
-  rails (~> 4.1.5)
+  rails (~> 4.1.8)
   rmagick
   ruby-imagespec!
   ruby-prof