Joined Querys entfernt.
Controller API leicht modifiziert, Abstract entfernt.
Merge branch 'master' of https://github.com/CornyPhoenix/PTP-Projekt.git

Conflicts:
	src/main/java/de/ptp/project/controllers/AccountController.java
	src/main/java/de/ptp/project/models/DBConnector.java
	src/main/java/de/ptp/project/models/DBConnectorImpl.java