Add the Geant4 Monte Carlo radiation transport toolkit and its Python bindings.
update bud to 0.32.0 (WIP)
update google music-manager
rJava: adding missing dependencies and JAVA-env-variables
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.
dhcpcd: update from 6.4.3 to 6.4.7
Add haskell package wai-util to nixpkgs
Updates camlp5 6.11 -> 6.12
hol_light: update to r199

And adds compatibility with camlp5-6.12
fetchurl: resume download of curl exits with status code 18
nixos: Add option services.cron.cronFiles

This allows you to configure extra files that should be appended to your
crontab. Implemented by writing to /etc/crontab when the cron service starts.
Would be nicer to use a cron that supports /etc/cron.d but that would require
us to patch vixie-cron.
coq-containers: package is broken
giflib: default to 5.0.5

5.1.0 apparenlty breaks a bunch of stuff, see comments on
https://github.com/NixOS/nixpkgs/commit/61f8cee6ce16ed8c312cc86a987c35f014c0a36e
geany: Update from 1.23.1 to 1.24.1

Closes #4359
Copy.com: update package to 1.47.0410 (upstream update)

Closes #4355
assimp: initial package expression for version 3.1.1

Open Asset Import Library is a library for importing 3D models in
various formats

Closes #4352
xfe: Update from 1.34 to 1.37

Closes #4362