canFindJSDocConf = (jsdocConfPath) => {
  try {
    fs.accessSync(jsdocConfPath, fs.F_OK);
    return true;
  } catch (err) {
    gutil.log(gutil.colors.red(
      `Unable to find jsdoc Config File @ '${jsdocConfPath}'`
    ));
    gutil.log(err);
    return false;
  }
}
Helper method that checks the JSDoc config file exists.
@param {string} jsdocConfPath
@return {Promise}