This is necessary so Gemnesium will be green.
The original commit came from @amazonwebservices and @trevorrowe in #579. I had to revise the commit and make sure all the test cases are passing. All credits still goes to those guys, thanks a lot!
This test will generate a basic Rails application, include Paperclip into Gemfile, and call basic `has_attached_file` in the model. This will make sure that we're not messing up any of the configuration and integration for our gem and the Rails framework.
…rade Rails 3.1 beta to latest version
This will fix the problem with Psych on the old version of Rails 2.x