validate timelog lines
xmonad: mod+s for scrot screenshots (doesn't really work)

I'm not sure why it doesn't work yet, but I have some guesses.  There's
got to be a way to run scrot such that it can grab mouse control but
unsafeSpawn doesn't seem to be it.
.zshrc: extra space in prompt
fork @thcipriani's grab script for screenshots

TODO:  for make_public(), use scp to p1k3.com or similar.  Also maybe
make this configurable with a .grabrc or something.
gif_sel:  byzanz + xrectsel wrapper to make gif of selected screen area

TODO:  Different time windows.
chmod +x clip2firefox
an improved comment in timelog