Merge pull request #9 from andrew12/master

Make the README more Markdowny.
INFO <username> now shows what nicknames are logged in.

Also nuke a few old files that I don't update anymore...
I'll go ahead and pretend I care about this buffer...
Add support for receiving "secure" messages to nick!service@server.

I'm not sure why this was broken.. it looks like I thought of it
originally but never fully implemented it for some reason. Thanks
to taiga for noticing.
Bug fix for expiring users... again.

This time it happened when the user was logged in for over 30 days
and shrike was shut down or restarted. When shutting down shrike
didn't log out logged in users, so upon restart they were seen as having
logged in over 30 days ago and were thus expired. Shrike now logs out
users upon graceful shut down.
Fix a typo that's been there for probably seven years (thanks nenolod).