Use a db seed file to configure foreman

This _should_ give us a working foreman instance for provisioning on $PRIVATE_NETWORK. Give it a try :)

Also improves the class param experience, see screenshot below

![2013-06-05-144220_1016x590_scrot](https://f.cloud.github.com/assets/827786/612653/03dbb978-cdf1-11e2-8262-7e48128e5e34.png)