finish of moving car selection to preferences
Merge remote-tracking branch 'origin/develop' into develop

Conflicts:
	org.envirocar.app/res/layout/my_garage_layout.xml
	org.envirocar.app/res/xml/preferences.xml
	org.envirocar.app/src/org/envirocar/app/activity/preference/CarSelectionPreference.java
	org.envirocar.app/src/org/envirocar/app/application/CarManager.java
	org.envirocar.app/src/org/envirocar/app/model/Car.java