Configure nine.bb.net

Adds a few new roles:

* nginx (not complete yet)
* supervisor (complete)
* supervisor-service (work in progress)
Since this template contains only the value of a variable, I suggest considering the `content` option in the `copy` module for the task that uses this template. From [the docs](http://docs.ansible.com/copy_module.html):
> When used instead of 'src', sets the contents of a file directly to the specified value. (added in Ansible 1.1)

My recollection is the contents won't be shown either, allowing private things to be set.