Using global consts instead of Application::DEFAULT_*
	modified:   library/Application/Application.php
Implement Abstract_Controller, Abstract_Model, Abstract_View
	modified:   application/controllers/Index/Index.php
	library/Abstract_Controller/
	library/Abstract_Model/
	library/Abstract_View/
Missed from previous commit
	new file:   library/Abstract_Controller/Abstract_Controller.php
	new file:   library/Abstract_Model/Abstract_Model.php
	new file:   library/Abstract_View/Abstract_View.php