Roll Observatory packages and add a roll script

packages/intl/example/basic/basic_example_runner.dart

Index: packages/intl/example/basic/basic_example_runner.dart
diff --git a/packages/intl/example/basic/basic_example_runner.dart b/packages/intl/example/basic/basic_example_runner.dart
new file mode 100644
index 0000000000000000000000000000000000000000..805d4f708474b86e19f5c957f2b446670b14016c
--- /dev/null
+++ b/packages/intl/example/basic/basic_example_runner.dart
@@ -0,0 +1,14 @@
+// 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 just a shell that runs the code in basic_example.dart, leaving
+ * that as a library that can also be run by tests.
+ */
+
+import 'basic_example.dart';
+
+main() {
+  setup(runProgram, print);
+}