How can I promisify the MongoDB native Javascript driver using bluebird?

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The 2.0 branch documentation contains a better promisification guide https://github.com/petkaantonov/bluebird/blob/master/API.md#promisification

It actually has mongodb example which is much simpler:

var Promise = require("bluebird");
var MongoDB = require("mongodb");
Promise.promisifyAll(MongoDB);

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