Laravel 4

Hi, I've trying to upgrade this bundle to work with Laravel 4 (#3). These changes aren't backwards compatible with Laravel 3 but I don't know if you want to continue to support that (can make a fork if necessary).

Main changes are restructuring to add a namespace (autoloaded with PSR-0), adding a composer.json so it can be used on Packagist and adding a service provider.

I'm still working on getting the tests to work, but it seems difficult to get facades to play nicely - I might try stubbing out Config completely. I've added composer dependencies for parts of illuminate and added a phpunit.xml for the time being.