Make Sotable compatible xhtml

comparisons of node names (via the nodeName property) are done in upper case. However, nodeName is lower case in xhtml. Let's do everything in upper case.

Sortable.js

@@ -809,7 +809,7 @@
 			do {
 				if (
 					(tag === '>*' && el.parentNode === ctx) || (
-						(tag === '' || el.nodeName == tag) &&
+						(tag === '' || el.nodeName.toUpperCase() == tag) &&
 						(!selector.length || ((' ' + el.className + ' ').match(re) || []).length == selector.length)
 					)
 				) {
@@ -937,7 +937,7 @@
 	 */
 	function _index(/**HTMLElement*/el) {
 		var index = 0;
-		while (el && (el = el.previousElementSibling) && (el.nodeName !== 'TEMPLATE')) {
+		while (el && (el = el.previousElementSibling) && (el.nodeName.toUpperCase() !== 'TEMPLATE')) {
 			index++;
 		}
 		return index;