Improvements to Lemon Refresh

Done:
- Fixed error where .png images were not actually transparent.
- Dragging now addes 1/8 of a lemon at a time.

To do:
- make lemon spin immediately upon the last piece being added
- lemon spins way too fast for some reason
- if refreshing, make scrollView inset to minimum to make lemon visible
Merge branch 'dennis' into chris