Have you wondered how to best take advantage of all of the data you can track about your life these days using devices (such as a fitbit, withings scale, basis band), mobile apps (like runkeeper, foursquare) or services (like 23andme)?  If your answer is yes, you are part of a growing global movement known as quantified self. Those interested in the movement believe that through the use of gadgets, smartphones, and various applications we can fully quantify our lives and make behavior changes, i …