hackage-packages.nix: update Haskell package set

This update was generated by hackage2nix v20151217-10-ga610b1b using the following inputs:

  - Nixpkgs: https://github.com/NixOS/nixpkgs/commit/096bee7aef8258ca1d62544c2ddd9f82008af9e8
  - Hackage: https://github.com/commercialhaskell/all-cabal-hashes/commit/735e006a185b5a0b998e33eb7deab87cd71ef8df
  - LTS Haskell: https://github.com/fpco/lts-haskell/commit/bbcada892fe77b0f4cdb3efca602c85a872e888b
  - Stackage Nightly: https://github.com/fpco/stackage-nightly/commit/b41dbc58b210ff13eccf71b04d9ed7055aa07df3