DatePicker is picking the wrong date

    bug:3375074

    1. The logic for updating the higher rank fields on wrapping of
       lower rank ones was incorrect. Updated that logic.

    2. On reaching the min/max date the spinners did not stop
       when reaching that date. Now spinners stop at min/max.

    3. Fixed a couple of edge case bugs while setting the
       the min and max dates of the DatePicker on the fly.

    4. Restricted the scrolling/flinging to end at the min
       and max dates.

Change-Id: Ibb588ea2cf951cf8d50328bbfbe7ebdad7ee8067