Roll Observatory packages and add a roll script

polymer/lib/default_build.dart

Index: polymer/lib/default_build.dart
diff --git a/polymer/lib/default_build.dart b/polymer/lib/default_build.dart
deleted file mode 100644
index 8e1c246fbe613c192fa5f3274080a3d8c46e8791..0000000000000000000000000000000000000000
--- a/polymer/lib/default_build.dart
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright (c) 2013, 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.
-
-/// Library that defines a main which calls build() from builder.dart. For
-/// polymer projects the build.dart file can simply export this to make the
-/// linter run on all of the entry points defined in your pubspec.yaml.
-library polymer.default_build;
-
-import 'builder.dart';
-
-main(args) {
-  lint(options: parseOptions(args));
-}