Support for Laravel 4.2

I just started playing with Laravel 4.2 and got a lot of issues installing this package. I have suggested the following allowing for 4.1.* and 4.2.* installations.

I believe this would work if not let me know of way.
Updated from >= to tildas ~
Merge pull request #44 from bweston92/patch-1

Support for Laravel 4.2