orts config content
	 */
	public function export() {
		if ( defined( 'JSON_PRETTY_PRINT' ) )
			$content = json_encode( $this->_data, JSON_PRETTY_PRINT );
		else
			$content = json_encode( $this->_data );

		return $content;
	}



	/**
	 * Imports config content
	 */
	public function import( $filename ) {
		if ( file_exists( $filename ) && is_readable( $filename ) ) {
			$content = file_get_contents( $filename );
			if ( substr( $content, 0, 14 ) == '