MaintenanceState erstellt und eine rudimentäres Keypad
add mockito, make parking cost load config configurable
Merge branch 'master' into sz/maintenancestate
aktueller status
add all states. Refactor controller
implement more state mehtods
add some tests
checkstyle
Merge branch 'states' into unittests
tests passing
Merge branch 'master' into parkingCost

Conflicts:
	src/main/java/ch/zhaw/id5848/parkingmeter/core/ParkingCostManager.java
	src/test/java/ch/zhaw/id5848/parkingmeter/core/ParkingCostManagerTest.java
	src/test/resources/config/coinBoxes.xml
add missing coinbox