[ack] Ignore log dir by default

More often than not this spews a ton of results I don't want.
[emacs] Update rust snippets
[weechat] List commands used to configure weechat

This is more wieldy than checking in config files because
they are large (full of defaults) and numerous.
Merge branch 'master' of https://github.com/dmac/dotfiles
[vim] Vundle shouldn't be a submodule