code: function renderString(templateString, options, callback) {
    var template = builtTemplateFromString(templateString, '', options);
    return template.render({ model: options, }, callback);
  }
docs: Render directly from a string
  @param {String} templateString The template string
  @param {Object} options The model to pass to the view
  @param {Function} callback (Optional) The async node style callback