Roll Observatory packages and add a roll script

packages/intl/test/date_time_format_http_request_test.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// or details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/**
+ * Test date formatting and parsing using locale data read via an http request
+ * to a server.
+ */
+
+library date_time_format_http_request_test;
+
+import 'dart:html';
+import 'package:unittest/html_config.dart';
+import 'package:unittest/unittest.dart';
+import 'package:intl/date_symbol_data_http_request.dart';
+import 'date_time_format_test_stub.dart';
+
+main() {
+  useHtmlConfiguration();
+  var url = "http://localhost:${window.location.port}"
+      "/packages/intl/src/data/dates/";
+
+  test("Initializing a locale that needs fallback", () {
+    initializeDateFormatting("de_DE", url).then(expectAsync((_) => true));
+  });
+
+  runWith(smallSetOfLocales, url, initializeDateFormatting);
+}