Added support for Pixelate to be used on video also.

Pixelate also supports video now, added an example.
new options are: video:boolean, videoW:number, videoH:number and the
selected object is the video it self.
ex. var myPixelation = new ClosePixelation( v, [
{ resolution : 8,shape:'circle', video:true, videoW:w, videoH:h }
]);

Script also contains extra function for requestAnimationFrame

Also added an example that can showcase this functionality.