fix(router): fix for leading slash in dart

Using string1 === string2 translates to identical(string1, string2) in
dart, which is incorrect as it is possilbe for dart strings to have
different reference.

modules/angular2/src/router/route_recognizer.js

@@ -43,7 +43,7 @@ export class RouteRecognizer {
         StringMapWrapper.set(solution, 'params', pathRecognizer.parseParams(url));
 
         //TODO(btford): determine a good generic way to deal with terminal matches
-        if (url === '/') {
+        if (url == '/') {
           StringMapWrapper.set(solution, 'matchedUrl', '/');
           StringMapWrapper.set(solution, 'unmatchedUrl', '');
         } else {