/**
* Constructs the class.<br />
* As a singleton, this method is protected, to defend from external creating.
*/
protected function __construct()
{
// This class shouldn't depend on any other, so there is no need for any updating process (replacing this file
//by a newer version should just work directly
self::$instance = $this;
// We construct the classes that need to be built at the beginning
$this->__get('session');
$this->__get('site');
}
