introduce web_components pkg for consolidated polyfills

pkg/html_import/README.md

Index: pkg/html_import/README.md
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-# HTML Imports polyfill
-
-[HTML Imports][1] are a way to include and reuse HTML documents in other HTML
-documents. As `<script>` tags let authors include external Javascript in their
-pages, imports let authors load full HTML resources.  In particular, imports let
-authors include [Custom Element](https://github.com/Polymer/CustomElements)
-definitions from external URLs.
-
-
-## Getting started
-
-Include the `html_import.debug.js` or `html_import.min.js` (minified) file in
-your project.
-
-    <script src="packages/html_import/html_import.debug.js"></script>
-
-`html_import.debug.js` is the debug loader and uses `document.write` to load
-additional modules.
-
-Use the minified version (`html_import.min.js`) if you need to load the file
-dynamically.
-
-## Basic usage
-
-For HTML imports use the `import` relation on a standard `<link>` tag, for
-example:
-
-    <link rel="import" href="import-file.html">
-
-## Polyfill details
-
-You can read more about how the polyfill is implemented in JavaScript here:
-<https://github.com/Polymer/HTMLImports/tree/master#polyfill-details>
-
-## Getting the source code
-
-This package is built from:
-<https://github.com/Polymer/HTMLImports/tree/master>
-
-You'll need [node.js](http://nodejs.org) to rebuild the JS file. Use
-`npm install` to get dependencies and `grunt` to build.
-
-[1]: https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/imports/index.html