fix(url_resolver): in Dart make package urls relative to AppRootUrl

modules/angular2/src/services/url_resolver.dart

@@ -1,9 +1,15 @@
 library angular2.src.services.url_resolver;
 
 import 'package:angular2/di.dart' show Injectable;
+import 'package:angular2/src/services/app_root_url.dart' show AppRootUrl;
 
 @Injectable()
 class UrlResolver {
+
+  final AppRootUrl _appRootUrl;
+
+  UrlResolver(this._appRootUrl);
+
   /**
    * Resolves the `url` given the `baseUrl`:
    * - when the `url` is null, the `baseUrl` is returned,
@@ -20,7 +26,8 @@ class UrlResolver {
     Uri uri = Uri.parse(url);
 
     if (uri.scheme == 'package') {
-      return '/packages/${uri.path}';
+      var maybeSlash = _appRootUrl.value.endsWith('/') ? '' : '/';
+      return '${_appRootUrl.value}${maybeSlash}packages/${uri.path}';
     }
 
     if (uri.isAbsolute) return uri.toString();

modules/angular2/src/services/url_resolver.ts

@@ -7,6 +7,7 @@ import {
   normalizeBlank
 } from 'angular2/src/facade/lang';
 import {ListWrapper} from 'angular2/src/facade/collection';
+import {AppRootUrl} from 'angular2/src/services/app_root_url';
 
 /**
  * Used by the {@link Compiler} when resolving HTML and CSS template URLs.
@@ -17,6 +18,8 @@ import {ListWrapper} from 'angular2/src/facade/collection';
  */
 @Injectable()
 export class UrlResolver {
+  constructor(_: AppRootUrl) {}
+
   /**
    * Resolves the `url` given the `baseUrl`:
    * - when the `url` is null, the `baseUrl` is returned,