Multiple YUI versions proposal

gistfile1.txt

<script>
YUI_GLOBAL_NAMESPACE = 'YUI360';
</script>

<script src="yui3.6.0.js">

function(Y, YUI) { 3.6.0 YUI. }

<script>
YUI_GLOBAL_NAMESPACE = 'YUI341';
</script>

<script src="yui3.4.1.js">

function(Y, YUI) {
	YUI360().use('treeview', function(Y360) {
		Y360
	});
}


<script>
YUI_GLOBAL_NAMESPACE = null;
</script>

<script src="yui3.x.y.js">

function(Y, YUI) {}