super-user-spark: switch to haskellPackages LTS 8.x GHC 8.0.2

This updates super-user-spark to support the recent change in nixpkgs
of the haskellPackages to LTS 8.x using GHC 8.0.2 [1].

It also includes some recent changes to the super-user-spark package,
upgraded to commit ab86356 [2].

[1]: https://www.mail-archive.com/nix-dev@lists.science.uu.nl/msg31818.html
[2]: https://github.com/NorfairKing/super-user-spark/tree/ab8635682d67842b9e6d909cf3c618014e4157f2