code: function (content, index, classes) {
  				return '<li' +
  				(typeof classes !== 'undefined' ? ' class="' + classes + '"' : '') +
  				(typeof index !== 'undefined' | null === index ? ' data-original-index="' + index + '"' : '') +
  				'>' + content + '</li>';
  			}
docs: Helper functions 
  @param content
  @param [index]
  @param [classes]
  @returns {string}