added super sonic invincibility

6-17-13
	x invincibility mode after a certain speed is gained
		x the players moves speed on z is increased
		x gravity is turned off on the player
		x should have a sayan like ball of energy envelope the player
		x anything the player runs into will blow up (just the robots, not
the walls)
		x this last for all of 15 seconds (later I should consider whether
it's a drain of something
			like a power up bar than just a count down but then I need to find
out what fills that bar
			if it's the speed ups you are getting or not.)
		x this entire function gets turned on and off based on the run speed
of the player