General improvements

Made a few improvements to the package:

1. Fixed possible typo (Rewrite instead of Rewriter)
2. Change to use a service provider instead.
3. Requires laravel 4.2 now
4. The file picker acts more the way laravel does by default. For example, if our environment is 'local' it will open the local config (if it exsists), and then check if the array key exists. If not, then it will open the config in the app/config folder. This helps to prevent the key not found errors, if they haven't specifically been set for that environment.
5. Removed unnecessary "october/support" requirement.