Reload ban files when reloading the server. Adds BUKKIT-3470
Preserve source block in mushroom spread event. Fixes BUKKIT-3354
Add BlockCocoa for diff visibility.
Call BlockGrowEvent for Cocoa plants. Fixes BUKKIT-2525
Ignore block functions for skulls on BlockPlace. Fixes BUKKIT-3495

Skulls don't normally get block data applied to them, so we shouldn't
apply it either.
Update Fireballs to account for ExplosionPower. Fixes BUKKIT-3460 Adds BUKKIT-3516
Remove erroneous break statement in scheduler. Fixes BUKKIT-3395