function reverseBezier(value)
	{
	    return [
	        1 - value[2],
	        1 - value[3],
	        1 - value[0],
	        1 - value[1]
	    ];
	}
Reverse a cubic bezier, needed for playing tweens backwards

@param {array} value - 4-length cubic bezier array
@returns {array}