Changes:
	-The runner now keeps moving to left at a constant speed until the end
of the map. The runner will jump is a jump is performed. 
	-The camera follows the runner when the runner is running. The camera
stops at the edge of the map.
	-The map is rendered from 1 pixel before the left of the camera and 1
pixel after right of the camera.
	-On desktop, space is now jumping and z is attacking.
	-The runner now can be controlled from android device. Swipe up to
perform a jump, tap to attack.