RFD: Reuse existing paginator?

Issue #18 describes how pagination, especially paginator.num_pages breaks if
{% autopaginate %} is called twice in the same template.

I do not understand how the render method works, at least for now, but my troubles
seem to go away, at least for now, if I re-use the existing paginator the other time
around.

Most likely this is the intended behavior originally and not having it so was a bug,
but I can't say for sure.

Apparently there is no state magick involved, so this should be ok from a
thread-safety point of view.

Do you think think it's ok? I'd hate to break it for everyone else.