hackage-packages.nix: update Haskell package set

This update was generated by hackage2nix v20151217-12-g567601b using the following inputs:

  - Nixpkgs: https://github.com/NixOS/nixpkgs/commit/82be4306aef14f3d97c4bf6bebcb875bf046b12e
  - Hackage: https://github.com/commercialhaskell/all-cabal-hashes/commit/300be01a1038afe0c7b12f3737b8c06f2103e855
  - LTS Haskell: https://github.com/fpco/lts-haskell/commit/45f9a3dc1607fcbd0be11ab4c185c0cb9baf9d99
  - Stackage Nightly: https://github.com/fpco/stackage-nightly/commit/18441cd11a18cd8f47f2e1efe89e02049b9e292f