Sort tags for consistent display

This ensures that the tag list will be consistent rather
than based on the browser’s internal hash implementation. It
also allows a custom override function to be configured when
simple alphabetic sorting is not sufficient.

Closes #342
Closes #505

source/js/VMM.Timeline.TimeNav.js

@@ -1545,6 +1545,9 @@ if(typeof VMM.Timeline != 'undefined' && typeof VMM.Timeline.TimeNav == 'undefin
 			
 			// CREATE TAGS
 			tags = VMM.Util.deDupeArray(tags);
+
+			config.tagSortFunction(tags);
+
 			if (tags.length > 3) {
 				config.nav.rows.current = config.nav.rows.half;
 			} else {

source/js/VMM.Timeline.js

@@ -135,7 +135,12 @@ if(typeof VMM != 'undefined' && typeof VMM.Timeline == 'undefined') {
 			ease: 					"easeInOutExpo",
 			duration: 				1000,
 			gmap_key: 				"",
-			language: 				VMM.Language
+			language: 				VMM.Language,
+			tagSortFunction: 		function (arr) {
+				arr.sort(function (a, b) {
+					return a.localeCompare(b);
+				})
+			}
 		};
 		
 		if ( w != null && w != "") {