Created controllers.
Implemented pages, articles, categories, and likes controllers.
Finished initial implementation of controllers.
Changed update to update_attributes.
Added current_user helper method.
Modified users controller so that the regular user can only update his/her own profile.
Added current_admin helper method.
Added viewed method for article model.
Added authentication and encryption methods for user and admin models.
Merge pull request #1 from ChenheliHua/controllers

Controllers