Add live preview

[niutech]

Please rename the branch from master to gh-pages, so the demo will have a live preview on: http://ryanstewart.github.com/phonegap-ratchet-demo

For now, you can use Github HTML Preview: http://htmlpreview.github.com/?https://github.com/ryanstewart/phonegap-ratchet-demo/blob/master/index.html