Enable sample to work as a Chrome Packaged App

- manifest.json, js/main.js, and img/star-128x128.png
added as essential fundamentals of a packaged app.

- Inline javascript removed to comply with the
packaged app content security model. js/index.js
created to contain the javascript for index.html.

- Hosted script references for jquery and google api client
modified to use local versions, again to comply with
content security model.