Update to Facebook SDK 3.8 and Phonegap 3.1.0

**This is a work in progress. It's only been tested on iOS.**

The progress on this plugin is very quiet and there seems to be things happening in different locations. I've generated this pull request to try and get a bit of discussion going on moving this forward for newer versions of phonegap/cordova.

**This renames the plugin at the same time to mirror the repo name so this won't upgrade without changes to your project**

There is also a few issues with the tools currently that stop this from being a seamless install. I'm not sure if I'm just missing something however as I'm quite new to Phonegap development. I've listed my problems in the readme here.

https://github.com/mallzee/phonegap-facebook-plugin#phonegap-310-installation