Mobs, preferably rideable

[edunham]

from a conversation in #bravo (https://gist.github.com/edunham/6856310)

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< simpson>| * Mounts. Epic mounts, whether equine, ovine, or porcine,
are simply not implemented. Which leads us to...
< simpson>| * Mobs. Yes, there is some initial work on mobs, and the
"MobManager", but this all needs to be structured and organized in a way
that works and is maintainable. Additionally, there are currently no
rules for actually spawning mobs, and we should fix that.