* Adding rspec as a development dependency and made it a rake task
* Add `abilities` helper to serialize a set of permissions for a model
* Inject the `can?`, `cannot?`, and `current_ability` methods into the serializer object so they are available as helper methods
* Adding info to the README about the abilities helper
Renaming to delete to destroy to match restful controller actions
Merge pull request #2 from LessonPlanet/add-serialization

Add abilities helper to serialize cancan permissions