Bug fix with routing

This should solve routing errors for anyone who wants to separate their admin config into several modules.

'model_config_path' => app('path') . '/modules',

'menu' => array(
        'Categories' => array('biz.config.admin.category'),
        //'Settings' => array('settings.site'),
),

If there is already a more proper way to handle this that I missed in the documentation please let me know!