function toRes(res, status=200) {
	return (err, thing) => {
		if (err) return res.status(500).send(err);

		if (thing && typeof thing.toObject==='function') {
			thing = thing.toObject();
		}
		res.status(status).json(thing);
	};
}
Creates a callback that proxies node callback style arguments to an Express Response object.
	@param {express.Response} res	Express HTTP Response
	@param {number} [status=200]	Status code to send on success

	@example
		list(req, res) {
			collection.find({}, toRes(res));
		}