Better travis integration, test with ruby 2.1.1 and several Gemfiles
Only use attr_accessible for affected versions
Add missing source in gemfiles
Rake is needed in the Gemfiles
Fix dependencies with several rails versions
Use minitest instead of test::unit because rails 4.1 does not want of test::unit
Remove rails 4 notice [ci-skip]
Fix typo in .travis.yml
Add array support to subjects_with_permission and objects_with_permission