Update Javadoc for EntityShootBowEvent.

Skeletons now return the bow that they shot in EntityShootBowEvent, rather
than null.
Merge #68

commit 0d20c5abf9bc6f6acabe154e289731d0d4e2b436
Author: GJ
Date:   2014-01-31 09:20:43 -0500

Update Javadoc for EntityShootBowEvent.

Skeletons now return the bow that they shot in EntityShootBowEvent, rather
than null.