Added notify.js support

I added notify.js (https://github.com/alexgibson/notify.js, it's a nifty wrapper around the notification API) to make notifications work on my browser(Firefox).
The notifications should work on the following browsers now:
- Chrome (desktop)
- Safari
- Firefox
- Firefox OS (v1.2+)
- Firefox Mobile (Android)

I'm not sure if's it proper to just include the full notify.js package, but you did that with the other plugins (jquery/fancybox/etc.) too, so I guess it's no problem.