Moved map, room and stuff to assets

this closes #26

	new file:   assets/edges.txt
	new file:   assets/map.txt
	new file:   assets/rooms.txt
	new file:   assets/vertices.txt
	modified:   src/de/unierlangen/like/customviews/MapView.java
	modified:   src/de/unierlangen/like/navigation/DijkstraRouter.java
	modified:   src/de/unierlangen/like/navigation/FileReader.java
	modified:   src/de/unierlangen/like/navigation/MapBuilder.java
	modified:   src/de/unierlangen/like/navigation/NavigationService.java
	modified:   src/de/unierlangen/like/navigation/RoomsDatabase.java
	modified:   src/de/unierlangen/like/ui/FindRoomActivity.java
	modified:   src/de/unierlangen/like/ui/MainYourLocationActivity.java