https://github.com/tadfisher/gradle2nix/pull/62
https://github.com/tadfisher/gradle2nix/tree/v2

fix
https://github.com/tadfisher/gradle2nix/issues/53
Cannot nix-build gradle2nix based on readme

todo
https://github.com/tadfisher/gradle2nix/pull/69
Fix buildGradlePackage overrides
