Add the Geant4 Monte Carlo radiation transport toolkit and its Python bindings.
update bud to 0.32.0 (WIP)
update google music-manager
update links
Allow ansible to install on darwin platforms

I am using this package on my Yosemite install of OS X and it works great. It also pretty closely follows the Homebrew recipe that most OS X users use, so I think we can open it up to other OS X users.
Update to latest ansible version
Removed all versions of geant4 except for the latest one.
Make path to Xcode configurable
tibia: update to 10.57
webkitgtk: bump to version 2.4.6
logstalgia: update from 1.0.3 to 1.0.5 and adopt it
XBMC AdvancedLauncher RetroArch launchers.

These are wrappers for retroarch wrappers, they are needed since launching a
process from XBMC(as a display manager and probably otherwise), using
AdvancedLauncher, results in it and it's parent recieving the same gamepad
input.

These wrappers will produce no sound on XBMC and AdvancedLauncher setups not
using a sound daemon, since XBMC gets paused while still holding onto the sound
device.
xbmc: enable plugins to be picked up from the store.
xmbcPlugins: svtplay added
Syntax fix for xbmc/retroarch in all-packages.nix
pythonPackages.webob: 1.3.1 -> 1.4
Merge pull request #4371 from joachifm/webkit_2_4_6

webkitgtk: bump to version 2.4.6
Merge pull request #3963 from christopherpoole/geant4

Add the Geant4 Monte Carlo radiation transport toolkit and its Python bindings.
Merge pull request #4078 from edwtjo/libretro-cores-addendum

XBMC RetroArch integration and some cores
Merge pull request #4207 from joefiorini/patch-1

Allow ansible to install on darwin platforms