Upgraded Rails from 3.2.13 to 3.2.15. Removed unneeded "~>" gem numbers in Gemfile.

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'rails', '3.2.13'
+gem 'rails', '3.2.15'
 
 # Bundle edge Rails instead:
 # gem 'rails', :git => 'git://github.com/rails/rails.git'
@@ -37,13 +37,13 @@ end
 # Gems used only for assets and not required
 # in production environments by default.
 group :assets do
-  gem 'sass-rails',   '~> 3.2.3'
-  gem 'coffee-rails', '~> 3.2.1'
+  gem 'sass-rails'
+  gem 'coffee-rails'
   gem 'jquery-fileupload-rails'
   # See https://github.com/sstephenson/execjs#readme for more supported runtimes
   # gem 'therubyracer', :platforms => :ruby
 
-  gem 'uglifier', '>= 1.0.3'
+  gem 'uglifier'
 end