vimPlugins.tagbar: add expression
recursive-pth-loader: build sitecustomize.pyc

If this file is not created at build time, then python (when run as root) will
create it at run time and mess up the consistency of the nix store.
recursive-pth-loader: fix python path

This should work for both python2 and python3.
haskell-thyme: enable unit tests
haskell-splot: re-generate expression with cabal2nix
cabal-install: update to version 1.18.0.1
haskell-unordered-containers: add version 0.2.3.2
haskell-system-posix-redirect: add version 1.1
haskell-boomerang: update to version 1.4.0
haskell-cereal-conduit: update to version 0.7.1
haskell-cipher-blowfish: update to version 0.0.2
haskell-cipher-des: update to version 0.0.4
haskell-conduit: update to version 1.0.7.4
haskell-cprng-aes: update to version 0.5.2
haskell-crypto-numbers: update to version 0.2.1
haskell-crypto-random: update to version 0.0.7
haskell-derive: update to version 2.5.13
haskell-gnutls: update to version 0.1.5
haskell-hamlet: update to version 1.1.7.2
haskell-heist: update to version 0.13.0