Create nix-shell environment for development computers

I used the bundix program to generate the gemset.nix file. You can
generate the same thing with `nix-env -iA bundix`.

I then quickly wrote a default.nix so that I can open a nix-shell in
the project directory, to make my life much, much easier to develop
with Nix and others.

I am keeping the other gemfiles for now, because I am developing over
several different systems and might need to keep it for now.

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