Add sqs to list of supported drivers

Just forgotten I presume.
Merge pull request #1765 from driesvints/develop

Add sqs to list of supported drivers
fire app shutdown event.
Fix CSRF token bug.
Added a sample IronMQ configuration.
Added new options to session config.
Exit with artisan status code.
Rename path to files.
Fix comment.
Added payload configuration option.
Merge branch 'develop' of git://github.com/laravel/laravel