Determine port based on scheme and allow arbitrary ports.
SSL support implemented

utilizes rust-ssl or rust-nss to optionally provide SSL services.
Get the OpenSSL patch compiling
Lots of SSL work.

This involves significant updates for Rust and rust-http changes, especially
the explicit ``IoResult`` stuff.

I've restructured it quite a bit to better suit my notions of how it should be
done, and also introduced a new ``./configure`` step before you can ``make``,
which will detect OpenSSL or NSS (I bet that my NSS detection in ``configure``
is incorrect).

The only change in runtime behaviour is that attempting to connect to an HTTPS
site when not compiled with SSL support will return an error (of kind
``InvalidInput``) rather than silently, confusingly and dangerously (should the
server accept it rather than rejecting it) sending plain text.
Remove non-functional NSS support.
Merge ssl and master.
Merge pull request #68 from chris-morgan/ssl

SSL client support