discussion: collaboration, 2.x, etc

On #18 @trifle wrote

> That said, I think the fact that almost everyone seems to need to fork warcproxy for their project is a sign that it might benefit from integrating changes back into the original project - at least that's what I'd love to see.

And @justinlittman wrote

> Agree.
> I recently noticed that @nlevitt has a mess of changes underway in #17. @nlevitt -- care to comment on the roadmap for 2?

I'm opening this issue as a place to discuss these questions and anything relating to them.