Added Hats to MoMMIs

Added hats. Currently, the hats are taken from the human hats.dmi, so all of the hats have to be centered on the MoMMIs, and there are a few visual issues when the hats are specifically drawn to be on a human's head (hair, beards, etc).

![hats](https://cloud.githubusercontent.com/assets/7979028/4262635/e3031138-3bae-11e4-8ba2-c4bda1f314be.png)