added reference to google play-library on Windows
maximize map on map click
new icon for destination marker on map
new notification icon
modified tour list items to not show the date anymore and to mark the
currently active tour, if applicable
extended API support down to level 11, removed some unneeded rescources
prepared to store more than two locations per tour: 
	- updated database schema
	- created database accessor methods for simple read/write
regular location updates