Merge remote-tracking branch 'gitup/groupfinding_module' into groupfinding_module

...src/main/java/unipotsdam/gf/interfaces/IGroupFinding.java

...n/src/main/java/unipotsdam/gf/modules/group/GroupDAO.java

.../src/main/java/unipotsdam/gf/modules/group/GroupView.java

...in/java/unipotsdam/gf/modules/group/GroupfindingImpl.java

...rschen/src/main/java/unipotsdam/gf/modules/user/User.java

...ain/java/unipotsdam/gf/process/GroupFormationProcess.java

...en/src/main/java/unipotsdam/gf/process/tasks/TaskDAO.java

...c/main/webapp/groupfinding/create-groups-learninggoal.jsp

...hen/src/main/webapp/groupfinding/create-groups-manual.jsp

...c/main/webapp/groupfinding/create-groups-manual_dummy.jsp

...src/main/webapp/groupfinding/css/create-groups-manual.css

...n/src/main/webapp/groupfinding/js/create-groups-manual.js

gemeinsamforschen/src/main/webapp/project/js/tasks.js

gemeinsamforschen/src/test/resources/database/fltrail.sql