code: function main(content, callback) {
    parser(content, function(error, result) {
      if (error) {
        callback(error);
      } else {
        callback(null, result);
      }
    });
  }
docs: Wiki Infobox parser main function
  @method main
  @param  {string}   content  wiki text to parse
  @param  {function} callback callback function