QuiverMob

Same as b13, but fixed me not removing a debug line. Hrm.

- Readded weapon-type specific names for Armed Skeletons (That got lost in the change to 1.7.10 and its lang files)
- I noticed a bit of a gap between regular mobs and Armed Skeletons, combat-wise, so I gave each skeleton on spawn a 50% chance to be Weakened, which gives it half health and firing speed.
  Ideally that will make them slightly less terrifying, on average. :)