Updated demo app to backbone 1.0, jQuery 1.9.1 and jQuery Mobile 1.3.0

I just had a look at your sample app and noticed that a few things won't work anymore when you are using the newest versions of the used libraries (respectively deprecation of jQuery `live()` and a change in the behavior of `pagehide` that led to no page elements being deleted). As this is still a great resource to start from when mixing jQM and backbone I think others might be interested in this repo being kept up to date as well?

Thanks!