fleshed out some story routes, added layout content
Merge pull request #11 from keaty/master

fleshed out some story routes, added layout content
removed stories#index from before_action :signed_in_user so that people can view stories when not signed in
Merge pull request #12 from keaty/master

removed stories#index from before_action :signed_in_user so that people ...
added some convoluted logic for displaying stories#show page differently depending upon who created it and how many contributions there are
Merge pull request #13 from keaty/master

added some convoluted logic for displaying stories#show page differently...
controller and model tests for contributions added