Use RegExp to handle optional rest and query segments

Use RegExp instead of pattern for app route, because Crossroads.js
extracts the query string as part of the rest segment. This is because
it does not support having both segments as optional.
See: millermedeiros/crossroads.js#130

src/js/lib/monster.routing.js

@@ -104,11 +104,17 @@ define(function(require) {
 		},
 
 		addDefaultRoutes: function() {
-			this.add('apps/{appName}:?query:', function(appName, query) {
+			this.add(/^apps\/([^/?]+)(?:\/[^?]*)?(\??.*)?$/, function(appName, query) {
 				// not logged in, do nothing to preserve potentially valid route to load after successful login
 				if (!monster.util.isLoggedIn()) {
 					return;
 				}
+
+				// Do not reload app if it is already loaded (just the rest segment or the query has changed)
+				if (monster.apps.getActiveApp() === appName) {
+					return;
+				}
+
 				var availableApps = monster.util.listAppStoreMetadata('user');
 
 				// try loading the requested app