Added relationship Group vs room, ref #16
Added funtionality to assign rooms to a group, ref #16
Added actions: manage_rooms, assign_room, unassign_room   to group_controller
Added Routes for all of them as group member routes
Added necessary views
TODO:Authentication still has to be done, as soon as admin role is defined
room can only be added to group, if not yet assigned ,ref #16
was still theoretically possible, by accessing the url
Added first tests for group_controller
Fixed Group Controller Assignment POC Test, ref #16
by reloading local variables from the database
Update README.md
Merge branch 'master' into dev
Merge branch 'dev'
small html fix | db migrate
Merged dev into feature/Grouprooms
Fixed Group Room Assignment test after merge, ref #16
Merge branch 'dev'
Merge pull request #115 from Atyanar/master

Merge Atyanar/master into hpi-swt2/Biber, ref #20, ref #16
Merge origin/Biber
Fix Merge Origin/Biber
Merge master into Biber
Delete, Modify tasks and users specs

Deleted task.rb and user.rb (Were replaced by tasks.rb and users.rb,
because the convention says so). Adopted the test code of the deleted files.
Merge remote Biber in Biber
Merge dev into Biber
Saves lifetime for everyone and page loading is accelerated to ~2s