Updated propertyChange method. #29
Added creator to Appointment class.
Renamed CalendarControll and moved AppointmentControl methods to CalendarControl
Finished working on AppointmentListener.
Merge remote-tracking branch 'origin/AppointmentListener' into PersonControl,GroupControl

Conflicts:
	src/no/ntnu/pu/model/Appointment.java
Merge branch 'master' into PersonControl,GroupControl

Conflicts:
	src/no/ntnu/pu/gui/view/MainView.java
	src/no/ntnu/pu/model/Person.java
Merge branch 'master' into PersonControl,GroupControl

Conflicts:
	src/no/ntnu/pu/gui/view/MainView.java
	src/no/ntnu/pu/model/Person.java