Make sure #create is available to users trying to create a profile.

 * See code comments for details. Basically the before_filter was
   preventing new users from being created by blocking #create in
   AuthorsController.
Require login to view and edit posts

 * Add has_many relationships in Author model.
 * Add belongs_to :author relationship for both Posts and Comments.
   * This field is currently not being assigned with a Post or Comment
     is created. Needs to be fixed. Param issue. And, look at routs.rb.
     Might be a good idea to set Posts,Comments as a sub-resource of
     Author.
 * Author fields in Post and Comment forms are currently commented out.
 * Add a bunch of migrations mostly centered around Authors having
   Posts and comments.
Style Posts Index page