[wmii] Expirimental regex-based tag support in tip.

Hi,

I've added *experimental* regex-based tag support to the repo. I
know it's a popular feature request, so, if you'd like to try
it, feel free to report any suggestions or bugs. The syntax is:
tag+othertag+/regex/

Be warned, though, that if you don't specify at least one tag
and the app is orphaned, wmii will probably crash (to be fixed,
of course). Note, also, that regex-based clients won't hold a
tag open. That is, if the only clients in a view are there only
because of a regex tag, and you change view, that view will
close. This is a feature.

Thanks,

-- 
Kris Maglione
You may know where the market is going, but you can't
possibly know where it's going after that.