Fix #55 - handle non-User user_class
Fix typo
Update to allow for custom user_class throughout

-Use :user for Post, Media, Comment modules pointing to custom class
-Add authenticate_user! and user_signed_in? helpers for custom User
class
-Misc fixes and slight refactoring to allow for custom user_class
Incorporate PR feedback
Update Guardfile
Remove logs in dummy app from gem
Merge pull request #57 from FlyoverWorks/handle_custom_user_class

Handle custom user class