Automated command usage message and cleaned up commands.
Merge branch 'master' of
https://github.com/kezz101/HarryPotterSpells.git

Conflicts:
	src/com/lavacraftserver/HarryPotterSpells/Commands/TeachAll.java
	src/com/lavacraftserver/HarryPotterSpells/Commands/Unteach.java