Roll Observatory packages and add a roll script

packages/polymer/test/template_attr_template_test_import.html

Index: packages/polymer/test/template_attr_template_test_import.html
diff --git a/packages/polymer/test/template_attr_template_test_import.html b/packages/polymer/test/template_attr_template_test_import.html
new file mode 100644
index 0000000000000000000000000000000000000000..e05538f3bedb7c5e6c2a2d26b28fc70bcc4e14ce
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+++ b/packages/polymer/test/template_attr_template_test_import.html
@@ -0,0 +1,13 @@
+<!--
+   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.
+-->
+<link rel="import" href="packages/polymer/polymer.html">
+<polymer-element name="decoration-test">
+  <template>
+    <select id="select">
+      <option template repeat="{{opt in options}}" value="{{opt}}">{{opt}}</option>
+    </select>
+  </template>
+</polymer-element>