Roll Observatory packages and add a roll script

packages/intl/example/basic/messages_th_th.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.
+
+/**
+ * This is a library that provides messages for a German locale. All the
+ * messages from the main program should be duplicated here with the same
+ * function name.
+ */
+library messages_th_TH;
+
+import 'package:intl/intl.dart';
+import 'package:intl/message_lookup_by_library.dart';
+
+final messages = new MessageLookup();
+
+class MessageLookup extends MessageLookupByLibrary {
+  get localeName => 'th_TH';
+
+  final messages = {
+    "runAt": (time, day) => Intl.message('วิ่ง $time on $day.')
+  };
+}