Helpful tips

I added the ssh password where it is needed in the instructions, since it had me stumped for a moment.

Secondly, I needed to set `DOCKER_HOST` to `tcp://localhost:4243` rather than just `localhost` for it to work with [Fig](https://github.com/orchardup/fig) (and presumably other tools which rely on this environment variable). Until I specified the full URL, I was simply seeing an obscure python error.