Replaced the CSS animations with CoffeeScript, since there was an overlap bug on new data arrival.
Let's use the 1.9 syntax.
Added the error and errors? method to the Fitbit wrapper class.
On data arrival, show an error when there is one (errors?) and hide the data view. If there isn't show the data and start animating (and hide the error view). Also when there is new data, start over with the animation.