Renaming (wait for it...)

GitHub's client seems really bad at putting "rename + edit" in one
commit.
Making mutton behave more appropriately.

Last checkin for 0.2.0.
Many business rules about mutton drops from sheep were missed and/or
incorrect:
- Mutton wasn't dropping if the sheep wasn't recently damaged by the
player.
- Baby sheep were dropping mutton.
- When the sheep died on fire, only raw mutton was dropping instead of
cooked.
- 0-2 mutton was dropping per kill instead of 1-3 like cows drop beef.
- Mutton was dropping even when the "doMobLoot" game rule was turned
off.