hackage-packages.nix: switch our default package set to Stackage Nightly
This update was generated by hackage2nix v20150903-82-g351b6f8 using the following inputs: - Hackage: https://github.com/commercialhaskell/all-cabal-hashes/commit/af161fdf178e996c83d9c06059cb81cc4480b035 - LTS Haskell: https://github.com/fpco/lts-haskell/commit/da73308b6359aa6083591ec7a2069090977d3be7 - Stackage Nightly: https://github.com/fpco/stackage-nightly/commit/1994a4f865fe7e1cbe2c5b94a2214a5d91507f2c
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