Add repo details to package.json.

Took me a few minutes to track down the source for this project, this might make it easier for the next person.

This is the result of running `npm init`.
Because `./node_modules/.bin/mocha` is only going to work on *nix.  These `npm` scripts are always run in the context and have access to binaries that we require.  So `mocha test --recursive` is the same thing as what you have (and does not rely on the global `mocha`), but it will work/run on Windows.