Override toString() for upcoming config changes. Also, this ability is
"Skull Splitter," not "Skull Spliiter"
MASSIVE config overhaul - most keys are now based on the "proper" name
given to a material or entity by Bukkit.

This WILL wipe some custom values you may have set, so please verify
that your values are what you want them to be after the new config file
is generated.
Making the error reporting for enabling mcMMO more informative.