relocate author and authorable concerns

Author: rsmithlal

…ncerns/better_together/author_concern.rb …ncerns/better_together/author_concern.rbapp/future_concerns/better_together/author_concern.rb renamed to app/models/concerns/better_together/author_concern.rb app/future_concerns/better_together/author_concern.rb renamed to app/models/concerns/better_together/author_concern.rb

@@ -7,7 +7,9 @@ module AuthorConcern
 
     included do
       has_many :authorships,
-               as: :authorable
+               as: :author
+      has_many :authorables,
+               through: :authorships
     end
   end
 end