gistfile1.txt

function mediawiki_page( $atts ) {
        $title = urlencode($atts['title']);

        if( false === ( $content = get_transient( 'mediawiki_' . $title ) ) ) {
                $url = 'http://wiki.sixohthree.com/w/index.php?title=' . $title . '&action=render';
                $response = wp_remote_get($url);
                $content = $response['body'];

                set_transient( 'mediawiki_' . $title, $content, 600 );
        }

        return $content;
}

add_shortcode('mediawiki', 'mediawiki_page');