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
156f20919b