update cart

Gemfile

@@ -50,3 +50,14 @@ group :development, :test do
   gem 'spring'
 end
 
+
+group :test do
+  gem 'minitest-reporters', '1.0.5'
+  gem 'mini_backtrace', '0.1.3'
+  gem 'guard-minitest', '2.3.1'
+end
+
+group :production do
+  gem 'pg',  '0.17.1'
+  gem 'rails_12factor', '0.0.2'
+end
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