function getCancelAnimationFrame () {
		var vendors = ['ms', 'moz', 'webkit', 'o'];

		for (var x = 0; x < vendors.length; x++) {
			if (window[vendors[x] + 'CancelAnimationFrame']) { return window[vendors[x] + 'CancelAnimationFrame']; }
			if (window[vendors[x] + 'CancelRequestAnimationFrame']) { return window[vendors[x] + 'CancelRequestAnimationFrame']; }
		}

		return function (id) { clearTimeout(id); };
	}
gets a prefixed cAF version or a polyfill to use if window.cancelAnimationFrame is not available
@returns {Function}