Add Rubytracer for Extjs

Gemfile

@@ -10,7 +10,7 @@ gem 'uglifier', '>= 1.3.0'
 # Use CoffeeScript for .coffee assets and views
 gem 'coffee-rails', '~> 4.1.0'
 # See https://github.com/rails/execjs#readme for more supported runtimes
-# gem 'therubyracer', platforms: :ruby
+gem 'therubyracer', platforms: :ruby
 
 # Use jquery as the JavaScript library
 gem 'jquery-rails'

Gemfile.lock

@@ -118,6 +118,7 @@ GEM
     kaminari (0.16.3)
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
+    libv8 (3.16.14.11)
     loofah (2.0.3)
       nokogiri (>= 1.5.9)
     mail (2.6.3)
@@ -168,6 +169,7 @@ GEM
       polyamorous (~> 1.2)
     rdoc (4.2.0)
       json (~> 1.4)
+    ref (2.0.0)
     responders (2.1.0)
       railties (>= 4.2.0, < 5)
     rspec-core (3.3.2)
@@ -211,6 +213,9 @@ GEM
       actionpack (>= 3.0)
       activesupport (>= 3.0)
       sprockets (>= 2.8, < 4.0)
+    therubyracer (0.12.2)
+      libv8 (~> 3.16.14.0)
+      ref
     thor (0.19.1)
     thread_safe (0.3.5)
     tilt (2.0.1)
@@ -248,6 +253,7 @@ DEPENDENCIES
   sdoc (~> 0.4.0)
   shoulda-matchers
   spring
+  therubyracer
   turbolinks
   uglifier (>= 1.3.0)
   web-console (~> 2.0)