Add events link to navigation ref #42
Merge branch 'Biber/feature/navigation' into dev
Add gems devise_openid_authenticatable and rack-openid to project, ref #9
Change devise user model and login, ref #9

  * add string identity_url to model
  * remove undesired devise options (like registration)
  * change sing_in view to openid only
Add logout button to navigation bar if logged in, ref #9
Restrict view access to signed in users only, ref #9

  * redirects to sign_in page if not logged in
Redirect user to their previous called page after login, ref #9
Restrict OpenID provider to HPI, ref #9
Add a sign-in-call to all controller tests, to fix all crashes, ref #9
Add group class ref #20
Merge remote-tracking branch 'origin/dev' into Biber/feature/groups
Merge branch 'Biber/feature/authentication' into dev, ref #9
Modified .travis.yml for heroku-support.
Repaired .travis.yml for use with Heroku
Merge branch 'Biber/feature/groups' into dev
Modify groups view spec ref #20
Merge remote-tracking branch 'origin/dev' into Biber/feature/groups
Merge branch 'Biber/feature/groups' into dev
#12 Added ability to view upcoming events for a room on its detail view
Link on the overview points to the detail view yet
Merge remote-tracking branch 'remotes/origin/master' into feature/#12