Bukkit

• Make sure when a spell is removed that a wand still has an active spell (same with materials)
• Implement activating and deactivating of spells like levitate and invincible, with cost draining.

Issues I've noticed in 1.7.2 so far:
- The lightning spell creates no visual effect
- Enchanting is a little wonky, something to do with swapping out the item for an enchantable one, I think. Seems to work though.