Allow poolboy to manage supervisors

[blatyo]

I'm using a library that generates connections as supervisors because there's multiple processes to manage the connection. Technically, the connection is a child of the supervisor, but every function that expect a process to be passed to it, expects the supervisor. Thus, I'd like to manage a pool of supervisors instead of workers. The problem I ran into is that poolboy's child_spec function will only create workers. I've worked around this by defining my own child spec. However, this seems plausible as something others would want to do.

One question I have is, is this a horrible idea because of something inherent to the way poolboy works?

If it's not, I'd be happy to contribute this feature.