Add dogesled.

fixes #14 
`?image=bobsled`

![image](https://f.cloud.github.com/assets/3876443/1999583/76d91c9c-8546-11e3-851c-7427432d7865.png)

`D7ozVVxKwhWjcF9r6QVJ7dCr69PpMJ1aEx`