matplotlib: fix build on darwin

* build with clangStdenv
* update to 1.2.1
google-talk-plugin: Upgrade to 4.2.10
Soprano: revert clucene update because it isn't found by the build system
haskell-language-java: update to version 0.2.5.1
haskell-elm-server: re-generate expression with cabal2nix
add python3 support to pythonPackages
python: include python version when prefixing python packages
recurse into python33 and pypy packages
Merge pull request #786 from NixOS/python3support

add python3 support to pythonPackages
python-markdown: 2.0.3 -> 2.3.1
numpy: 1.6.1 -> 1.7.1
simplejson: 2.1.3 -> 3.3.0
Logbook: 0.4.1 -> 0.4.2
zope_testrunner: 4.0.4 -> 4.4.1
psycopg2: 2.0.13 -> 2.5.1
distutils2: remove the package, nothing depends on it and it's obsolete
don't wrap scripts in EGG-INFO/scripts since they are called from python
gmvault: use logbook 0.4.2
git: find global configs in /etc/ instead of /etc
nose: remove failing test