Dockerise server

[SnijderC]

Move boulder server stuff from vagrant to docker.

[SnijderC]

We might be able just to use this: https://github.com/letsencrypt/boulder/blob/master/docker-compose.yml

[mrtndwrd]

Yup, that seems to work perfectly.

[SnijderC]

Do we want to take that code and include it in our repo?