This commit enables all haskellPackages builds so that we can discover builds
that have been fixed recently.
This update was generated by hackage2nix v20151217-12-g567601b using the following inputs:
- Nixpkgs: a67868f060
- Hackage: 1c84c94e14
- LTS Haskell: d2ad5fe903
- Stackage Nightly: c1be20cfc0