Tweaking Ansible setup-up plan.

Ansible is so ridiculously flexible and intuitive. I think that the more I use
it, the more I will realise the importance of conventions. At the moment my code
is not very modular. For example, I can't pull out my Postgres manifest because
it has an implicit dependency on the Misc manifest.

Anyway, it's a start. Now to run the Rails generators and get cracking!