0.15 released!

Hi,

I've just released version 0.15 of xmobar.  In the release notes below
you'll see there's a new compilation option to use GHC's threaded
runtime: one person has reported that xmobar won't work unless you set
that option, but i haven't been able to reproduce the problem:  please
let me know if you need it too, so that we make it the default.

I've been also having problems latetly with the disk usage monitor in my
thinkpad: since a couple months ago or so, xmobar will just die without
any warning, reason or rhyme every now and then... i'm blaming the
statfs FFI calls, because i would expect an exception or similar on the
Haskell side.  Please let me know if you're also suffering from this
problem.

Happy monitoring!

## Version 0.15 (June 4, 2012)

_Incompatible changes_

  - `Batt` monitor no longer uses `-c` to specify the charge file: it
    should figure things out by itself (cf. [issue 69]).

_New features_

  - New command line option, `-C`, that allows *adding* commands to
    those specified in the configuration file (Ben Boeckel).
  - Dependency on GHC's threaded runtime has been eliminated.