fixed the pellet number and falling

fixed the pellets falling and resting on the bottom. Also set a limit of
2 for number of pellets that can exist at any one time. The number of
pellets that can exist with the fish and pellet list combined is limited
to 2.
Merge branch 'fixups'

Conflicts:
	classes.py
	process.py
Merge branch 'fixups'

Conflicts:
	classes.py
	process.py
Merge
Merge branch 'master' into fixups