fix(DateFilter): should work on other locale

Now date filter work only on 'en' locale and if we set
Intl.defaultLocale other locale than 'en' it caoses LocaleDataException.

This patch fixes this bug.

Closes #604

lib/angular.dart

@@ -14,6 +14,7 @@ import 'dart:html' as dom;
 import 'dart:js' as js;
 import 'package:di/di.dart';
 import 'package:di/dynamic_injector.dart';
+import 'package:intl/date_symbol_data_local.dart';
 
 /**
  * If you are writing code accessed from Angular expressions, you must include

lib/bootstrap.dart

@@ -91,9 +91,11 @@ Injector ngBootstrap({
   return zone.run(() {
     var rootElements = [element];
     Injector injector = injectorFactory(ngModules);
-    var compiler = injector.get(Compiler);
-    var blockFactory = compiler(rootElements, injector.get(DirectiveMap));
-    blockFactory(injector, rootElements);
+    initializeDateFormatting(null, null).then((_) {
+      var compiler = injector.get(Compiler);
+      var blockFactory = compiler(rootElements, injector.get(DirectiveMap));
+      blockFactory(injector, rootElements);
+    });
     return injector;
   });
 }

test/filter/date_spec.dart

@@ -1,6 +1,7 @@
 library date_spec;
 
 import '../_specs.dart';
+import 'package:intl/intl.dart';
 
 void main() {
   describe('date', () {
@@ -64,5 +65,21 @@ void main() {
       date(noon, "shortTime");
       date(noon, "shortTime");
     });
+
+
+    it('should accept various locales', () {
+
+      try {
+        Intl.defaultLocale = 'de';
+        expect(date(noon, "medium")).
+        toEqual('Sep 3, 2010 12:05:08 nachm.');
+
+        Intl.defaultLocale = 'fr';
+        expect(date(noon, "medium")).
+        toEqual('sept. 3, 2010 12:05:08 PM');
+      } finally {
+        Intl.defaultLocale = 'en';
+      }
+    });
   });
 }