Use percentages (not hardware values) for volume
Update submodules
Add juliarc
WIP: Use X.H.DynamicBars

Not merged yet due to a bug in xmonad. See:

* http://www.haskell.org/pipermail/xmonad/2013-June/013764.html
* https://code.google.com/p/xmonad/issues/detail?id=538