HTTPS + Proxy


This change is fairly specific to our squid set-up, so I'd understand if you didn't want to pull it.

That said, it's the only thing I could get working and I *did* try getting squid to listen on HTTPS and continue using Net::HTTPS::NB through HTTP::Async, and it didn't work properly. Might be a flaw in Net::HTTPS::NB, might be that I'm just not smart enough :-)

If you do pull this change then hopefully the new code and the comment I added will at least give people an idea of how they can make things work, if anybody else ever comes across this same problem.