Roll Observatory packages and add a roll script

polymer/lib/src/build/constants.dart

Index: polymer/lib/src/build/constants.dart
diff --git a/polymer/lib/src/build/constants.dart b/polymer/lib/src/build/constants.dart
deleted file mode 100644
index bc3753216e61f8749b5374e3a80338210e6d0d21..0000000000000000000000000000000000000000
--- a/polymer/lib/src/build/constants.dart
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright (c) 2014, 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 polymer.src.build.constants;
-
-/// These names have meaning in SVG or MathML, so they aren't allowed as custom
-/// tags. See [isCustomTagName].
-const invalidTagNames = const {
-  'annotation-xml': '',
-  'color-profile': '',
-  'font-face': '',
-  'font-face-src': '',
-  'font-face-uri': '',
-  'font-face-format': '',
-  'font-face-name': '',
-  'missing-glyph': '',
-};
-
-const POLYMER_EXPERIMENTAL_HTML = 'packages/polymer/polymer_experimental.html';