This patch adds SSL support for nntplib, since it
really isn't that simple to just extend the class and
add such support, and there are plenty of NNTP servers
out there which can only be accessed over SSL. Should
be backwards compatible with nntplib, and has been
tested to be as such. Of course this library faces
limitations on how well it can authenticate SSL
certificates due to current limitations (as of 2.4) in
socket.ssl, no new additions seem to have been made in
2.5, at least none are listed