Bukkit

Changes:

• Updated DynamicDifficulty to craftbukkit-1.6.4-R2.0.

Known issues:

• DynamicDifficulty will generate a NullPointerException whenever a mob not found in the list of dynamically changing mobs untargets a player.
• Occasionally, DynamicDifficulty will lose its data about a logged in player causing a NullPointerException whenever it tries to access the missing data.