Merge pull request #1418 from NixOS/module-package

Make the in-tree package the default package

nixos-modules/hydra.nix

@@ -68,7 +68,7 @@ in
 
       package = mkOption {
         type = types.path;
-        default = pkgs.hydra_unstable;
+        default = pkgs.hydra;
         defaultText = literalExpression "pkgs.hydra";
         description = "The Hydra package.";
       };