code: function (items) {
              for (var i = items.length - 1; i > 0; i--) {
                  var j = Math.floor(Math.random() * (i + 1));
                  util.swap(items, i, j);
              }
          }
docs: Shuffles the given array using [Fisher-Yates shuffle](http://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle).