code: function getActiveStepCount() {
              var tourWrapper = jQuery('.cd-tour-wrapper'), //get the wrapper element
                  tourSteps = tourWrapper.children('li'); //get all its children with tag 'li'
  
              var current_index = 0;
              tourSteps.each(function (index, li) {
                  if (jQuery(li).hasClass('is-selected'))
                      current_index = index;
              });
  
              return current_index;
          }
docs: this returns the active step number
  @return {number}