Update gem for rspec 3 and rails 4 1

This PR is updating the gem to work with rspec 3 by using the expectation syntax. I updated the hash syntax to ruby 1.9. I also bumped up the rails gems to the latest and added rails 4.1.1 to appraisal and bumped up the gems to the latest in Gemfile.lock

Awesome project! Thanks a lot for open sourcing and maintaining!