LAPPS-30
- new findByParameter method which orders and makes pages
- createAppInstance in AppFacade
- refactoring and improvements
Merge branch 'develop' into domain_model_improvements

Conflicts:
	LAPPS-backend/src/main/java/de/rwth/dbis/layers/lapps/domain/AppInstanceFacade.java
	LAPPS-backend/src/main/java/de/rwth/dbis/layers/lapps/entity/AppInstanceEntity.java
Merge pull request #92 from learning-layers/domain_model_improvements

LAPPS-30