This is Isaac Salzberg's application of Mihai Ibanescu's patch
(available on SF) that allows HTTPS tunneling through an
authenticating proxy.

This one's a double whammy: it works with IIS through the 
authenticating proxy, whereas the one on SF, which uses Python's
built-in SSL, doesn't.

This code is not folded into the main distribution because:

1. Apparently Mihai is still working on it.
2. Mihai uses Python's built-in SSL. Isaac patched it to use
   M2Crypto.SSL. The stuff is essentially #ifdef'ed code.
3. I don't have an authenticating proxy nor an IIS server to test
   against, so I can't clean up the code. Volunteers welcome. ;-)

Thanks Isaac.