Remove references to Cbac from internal application
Make badge point to current release branch
Fix a test in Ruby 2+

As discussed in http://tenderlovemaking.com/2012/09/07/protected-methods-and-ruby-2-0.html,
respond_to? returns false for protected methods from Ruby 2.0 onwards
Merge pull request #28 from ReneB/master

Pull in README and test changes.