Build against Bukkit-1.5.1-R0.2, new features

Added 'Throw' feature to explosions, to make explosions throw players
and mobs.
Added 'CustomExplosion' features to the WitherSkullControl and the
FireballControl.
Added feature to make PigZombies spawn as baby.
Added feature to make wolves angry when spawned.
Added feature to make wolves sit when they spawn.
Added feature to give wolves random collar colors.
Build against Bukkit-1.5.1-R0.2