Roll Observatory packages and add a roll script

web_components/pubspec.yaml

-name: web_components
-version: 0.11.4+2
-author: Polymer.dart Authors <web-ui-dev@dartlang.org>
-homepage: https://www.dartlang.org/polymer-dart/
-description: >
-  Polyfills for Shadow DOM, Custom Elements, and HTML Imports.
-  Custom Elements let authors define their own elements. Authors associate code
-  with custom tag names, and then use those custom tag names as they would any
-  standard tag. Shadow DOM is designed to provide encapsulation for custom
-  elements, by hiding DOM subtrees under shadow roots. HTML Imports let authors
-  bundle code and HTML as if they were libraries.
-dependencies:
-  analyzer: '>=0.22.4 <0.26.0'
-  barback: '>=0.14.2 <0.16.0'
-  code_transformers: '^0.2.7'
-  html: '^0.12.0'
-  initialize: '^0.6.0'
-  path: '^1.3.0'
-dev_dependencies:
-  unittest: '^0.11.0'
-  browser: '^0.10.0'
-transformers:
-- web_components/build/mirrors_remover:
-    $include: 'lib/src/init.dart'
-- web_components:
-    $include: '**/*_test.html'
-    entry_points:
-      - test/custom_element_test.html
-      - test/custom_element_proxy_test.html
-      - test/html_import_annotation_test.html
-      - test/init_web_components_test.html
-
-environment:
-  sdk: ">=1.9.0-dev.7.1 <2.0.0"