hackage-packages.nix: update Haskell package set

This update was generated by hackage2nix v20151217-5-ged07a8e using the following inputs:

  - Nixpkgs: https://github.com/NixOS/nixpkgs/commit/f24e81fbd318567e102841e7815b23f73ce0d07e
  - Hackage: https://github.com/commercialhaskell/all-cabal-hashes/commit/01c9e56f5db0c9963bec403d9213312fd5326ac6
  - LTS Haskell: https://github.com/fpco/lts-haskell/commit/87e2d54643d6d6e4f8a3c7edffce9fa06eb9f0a0
  - Stackage Nightly: https://github.com/fpco/stackage-nightly/commit/c30758374f9a5d52c2cb917ce35d594781bb36d6