code: function queuePagesToLoadInOrder(start, end) {
          var increment = util.sign(end - start);
  
          while (start !== end) {
              api.queuePageToLoad(start);
              start += increment;
          }
          api.queuePageToLoad(start);
      }
docs: Queues pages to load in order from indexFrom to indexTo
  @param   {number} start The page index to start at
  @param   {number} end   The page index to end at
  @returns {void}