mutt: create stable branch

[Brendan Cully]

changeset: 6330:2ab618f4f6b0
user:      Brendan Cully <bren...@kublai.com>
date:      Tue Oct 22 21:11:55 2013 -0700
link:      http://dev.mutt.org/hg/mutt/rev/2ab618f4f6b0

create stable branch