public function addPath($path, $namespace = '', $prepend = FALSE) {
        if ($prepend === TRUE) {
            return $this->prependPath($path, $namespace);
        } else {
            if (!empty($namespace)) {
                $path = array (
                    $path, str_replace('_', '/', $namespace)
                );
            }           
            $this->paths []= $path;
        }
        return $this;
    }