Added autologout

I originally imagined this to be useless, but after noticing I forgot to
log myself out for months I decided to write this anyway. By default,
users will be logged out when they quit or leave all channels triggerbot
can see them in. For security reasons, when the bot loses the
connection, everyone is automatically logged out as well. We cannot be
sure what happens in the time we wait to come back. Someone could change
their nick and therefore take over someone else's account.