Rename test/dummy to test/dummy-rails3
Update Rakefile and test helpers to load correct version of dummy app
Set explicit Rails dependency version in Gemfile
Rename Gemfile to Gemfile.rails3, update Travis-CI configuration and README
New Gemfile.rails4 and lock file
Create Rails 4 dummy app by cloning existing dummy-rails3 app
Upgrade dummy-rails4 to Rails 4
Instructions for testing under Rails 4
Add fixture set helper methods to TestUtils module to fix deprecation warnings