31/8/13 - 23:44
fixed Singleteacher:
	- now only shows dates when user has none
	- option in Actionbar to delete date (not working yet)
	- shows the saved date for the user

implemented NavigationDrawer

Know Bugs:
	- Drawertitle doesnt stick in new activity
	- Drawer doesnt highlight current activity
	- delete option for singleteacher not yet working properly