增加redis gem文件

Gemfile

@@ -43,6 +43,7 @@ gem "rails_admin_import"
 gem "coffee-script-source"#, '1.8.0'
 gem "safe_yaml"
 gem 'tzinfo-data'
+gem 'redis'
 
 gem 'bcrypt-ruby', '~> 3.0.0', :require => "bcrypt"
 #gem 'rails_admin_example_theme', :git => 'git://github.com/bbenezech/rails_admin_example_theme.git'