function createMaximumsData() {
      var maxData = {};
      maxData[LEFT] = createMaximumVO(LEFT);
      maxData[RIGHT] = createMaximumVO(RIGHT);
      maxData[UP] = createMaximumVO(UP);
      maxData[DOWN] = createMaximumVO(DOWN);

      return maxData;
    }
Creats a map of directions to maximum swiped values.
@return Object A dictionary of maximum values, indexed by direction.
@inner