Fixed bug where if result is integer and zero an object is returned.
Fixed bug where if result is integer and zero an object is returned.

This bug manifested when you called `getBalance` and the resulting
balance was zero. Instead of a return value of zero, you would get
the response JSON object. This is because

    fn(null, data.result || data)

will ignore data.result if data.result === 0.

doged/node-dogecoindark,countable/node-dogecoin