Updated ar-drone dependency from 0.2.0 to 0.2.1 to get GPS data.

I'm working on a map plugin that uses GPS data from the AR.Drone Flight Recorder, and the first step is using the recently updated ar-drone lib that can parse GPS data.

![screen shot 2013-10-03 at 12 34 54 pm](https://f.cloud.github.com/assets/52466/1264674/0f04a9a6-2c63-11e3-87a6-1dd8af52009c.png)