public function __construct()
{
self::$cache_folder = new Folder(PATH_TO_ROOT . '/cache');
self::$tpl_cache_folder = new Folder(self::$cache_folder->get_path() . '/tpl');
self::$css_cache_folder = new Folder(self::$cache_folder->get_path() . '/css');
self::$syndication_cache_folder = new Folder(self::$cache_folder->get_path() . '/syndication');
}