New graphic for stamp checkmark and style consolidated into css file.
The tick and untick of checkmarks now persist through multiple stamps
pages. However it is still not persist in database.
Query result set is read only, so the stamps array has to be a copy of the
result set.
Add helper functions to deal with the slowness of Android emulator. It
enables key A and D to simulate swipe events.
Fix a bug where total number of stamps pages is display as zero when no
stamp is available (now display as one).