Slim package.json to avoid fields relevant to npm publication

[consideRatio]

The version field isn't required unless we want to do npm publish which we don't. Most things in package.json can be removed actually, so I removed most things.

By removing repository and license, we got two warnings.

npm WARN nbgitpuller No repository field.
npm WARN nbgitpuller No license field.

I think this is fine, and that a slimmed package.json helps make this repo's code be more understandable. For reference, see the package.json docs.

[manics]

Works for me locally