Initial commit for auto-view rendering.

I've also taken out all of the existing files that dealt with authentication and styling. KISS_Controller has been converted into a singleton and has an added KISS_Controller::get_instance() method for accessing it.

KISS_Controller is now able to detect a desired output format by looking for a file extension appended to the last parameter, action, or controller name, in that order. The view that is rended will be searched for within views/<controller>/<format>/<action>.php

The contents of the layouts directory also adhere to this structure; layouts/mainlayout.php will render the desired view with a customizable HTML structure - layouts/json/mainlayout.php will add the appropriate HTTP headers for json formatted output.