function unbindPointer(button) {
	// clear the event status
	pointer.bind[typeof button === "undefined" ? pointer.LEFT : button] = null;
}
unbind the defined keycode
@memberof input
@param {number} [button=input.pointer.LEFT] - (accordingly to W3C values : 0,1,2 for left, middle and right buttons)
@example
me.input.unbindPointer(me.input.pointer.LEFT);