REST api endpoint for UPDATE user,
swagger documentation
Add empty path to getAllUsers
Moved @Produces annotation from class to method,
LAPPS-69
Merge branch 'rest_api' of https://github.com/learning-layers/LAPPS.git
into rest_api

Conflicts:
	LAPPS-backend/src/main/java/de/rwth/dbis/layers/lapps/resource/UsersResource.java