Adds new race: corgi people. Currently admin-only.

Currently admin-only.

This PR was requested by @nienhaus who is also the one who made the sprites.

Pics:
![lcyctwf](https://cloud.githubusercontent.com/assets/6563111/5459026/fa64c184-8535-11e4-9cde-52278a43c1d7.png)
![2014-12-16-150706_83x128_scrot](https://cloud.githubusercontent.com/assets/6563111/5459008/dbf5e818-8535-11e4-8149-6aa0046d177a.png)