Roll Observatory packages and add a roll script

packages/intl/test/date_time_format_local_even_test.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for 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 which is available
+ * directly in the program as a constant. This tests one half the locales,
+ * since testing all of them takes long enough that it may cause timeouts in
+ * the test bots.
+ */
+
+library date_time_format_test_2;
+
+import 'date_time_format_test_stub.dart';
+import 'package:intl/date_symbol_data_local.dart';
+
+main() {
+  runWith(evenLocales, null, initializeDateFormatting);
+}