Removed version of uglifier.

Gemfile

@@ -23,7 +23,7 @@ group :assets do
 #  gem 'coffee-rails', '~> 4.0.0.rc1'
   gem 'sass-rails',   '~> 3.2.4'
   gem 'coffee-rails', '~> 3.2.2'
-  gem 'uglifier', '>= 1.2.3'
+  gem 'uglifier'
 end
 
 gem 'omniauth'