[alloy-ui] [Technical-Support] AUI-1402 Creating a TreeView from HTML markup is too slow

Hi @Bruno, @zsagia,

This is Zsolt's pull request.

I tested it with FF, Chrome, IE9, IE8, IE11 it works and is significantly faster then before.
Zsolt created a demo which worked well, but I modified it to be a bit fancier.
I also deleted the console.timer() from the demo, because it is not worked in IE8, but if you want to be impressed, you definitely should check it with console.timer.

Thank you in advance
Péter