Rewrite obstacle creation: higher probability to create one, if there was a switch to the left. Even higher, if the switch was where the player is. On straigh pieces, probability is low because player can only honk to escape the cows then. Add to editableComponents for tweaking.
Update track graphics from nico.
Merge branch 'master' of github.com:V-Play/AGJ13

Conflicts:
	qml/Level.qml