i3, i3status: Add i3 and i3status config files
Ignore mutt aliases and cache
weechat: Add weechat config files and scripts

irc.conf and jabber.conf excluded because they contain sensible information.
They will stay untracked until weechat developers allow a way to separate
sensible information from the rest.
Ignore logs/, irc.conf and jabber.conf weechat files