speed up startup (avoid loading some gems on startup)

correct group permission leaks
add Discourse.cache for richer caching support

spec/spec_helper.rb

@@ -33,10 +33,16 @@ Spork.prefork do
   # Loading more in this block will cause your tests to run faster. However,
   # if you change any configuration or code from libraries loaded here, you'll
   # need to restart spork for it take effect.
+  require 'fabrication'
+  require 'mocha/api'
+  require 'fakeweb'
+  require 'certified'
+
   ENV["RAILS_ENV"] ||= 'test'
   require File.expand_path("../../config/environment", __FILE__)
   require 'rspec/rails'
   require 'rspec/autorun'
+  require 'shoulda'
 
   # Requires supporting ruby files with custom matchers and macros, etc,
   # in spec/support/ and its subdirectories.