Adding comment unit tests
Changing contents to content
Changing contents to content for all models
Adding tests for Update model
Modifying comment factory
Fixing Novel and ShortStory to properly inherit from Story
Modifying migrations to take advantage of STI with stories
Updating validations to new syntax and add uniqueness validations where appropriate
Removed Novel and ShortStory controllers and related files. Because of STI, Story is dominant controller.
Changing Chapter to inheritance from Story as per STI