checkAuthentication is called by Main_Controller.
Merged setup and save views.
Started with the navigation controller, needs to get logic added. It does parse the navigation already.

The navigation view only contains html related to navigation
Commited the change in Webshop_Model.

WebshopSettings_Model now saves the $_POST data in the model and not in the controller.
settings.html.php is a settings sorta index page. Can be expanded later on to add 'admin' functionality.