removed shotgun from gemfile for heroku
added gem 'shotgun' back into gemfile to see if it works on heroku
put shotgun gem into a dev group
Merge pull request #7 from bbeaird/Daniel_fixing_posts

Fixed an error that arose when a user tried to navigate to a feed page t...
Merge branch 'master' of https://github.com/bbeaird/sinatra_skeleton into heroku_version
Merge pull request #8 from bbeaird/heroku_version

Heroku version
Made it so that users are authenticated based on session before being allowed to visit the page that allows them to add a new post to a feed.