hackage2nix.hs: update core packages for ghc 7.8.3
hackage2nix.hs: update core packages for ghc 7.8.3

spencerjanssen/cabal2nix,psibi/cabal2nix,bennofs/cabal2nix,jb55/cabal2nix,dmalikov/cabal2nix,Fuuzetsu/cabal2nix,gridaphobe/cabal2nix