lambdabot-core: add support for 'CODEPAGE' server command

  Our network uses CP1251, KOI8-R IRC ports and does
  not have ports with default UTF-8.

  But has 'CODEPAGE UTF-8' command.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
social: @auto-reply

This implements the commands "auto-reply", "auto-reply?" and
"clear-auto-reply". These can be used to tell people that you are on
vacation, or that you generally don't read your lambda messages in time
:-)
Merge branch 'master' of https://github.com/trofi/lambdabot
Merge branch 'master' of https://github.com/nomeata/lambdabot