Remove redundant gems from the Gemfile.

Gemfile

@@ -9,9 +9,6 @@ git 'git://github.com/refinery/refinerycms.git', :branch => 'master' do
     gem 'refinerycms-testing'
   end
 end
-gem 'refinerycms-i18n', github: 'refinery/refinerycms-i18n', branch: 'master'
-gem 'mime-types', '~> 1.16'
-gem 'protected_attributes'
 
 # Database Configuration
 unless ENV['TRAVIS']