Add assign/unassign user to group ref #40
Merge dev into b/groupUsers
Edit room and group translations
Fixed groups/show and groups/edit test.
Merge Biber into B/feature/#20
Refactored the two recently fixed tests.
Modify groups_controller to prevent unauthorized users from editing groups #20
Remove id from groups overview ref #20
Fix assign_user, user was assigned two times
Add group tests
Edit group translation
Fixed merge conflict by using Sebastian's changes instead of mine.
Merge branch 'B/feature/#20' of https://github.com/hpi-swt2/event-und-raumplanung into B/feature/#20
Edit assign rooms button in groups show view
Edit group translation to assign rooms
Edit groups edit and show view
Edit groups authentication ref #20
Refactor group tests
Merge branch 'Biber' into B/feature/#20

Conflicts:
	db/schema.rb
Merge branch 'B/feature/#20' into Biber