Joint color changes

I implemented a new visualization where the joint colors change based on acceleration. Red means the joint is speeding up, and blue means the joint is slowing down.  There are 3 versions below:

This one displays the bones changing color:

This one displays the joints changing color:

And this one displays the joints changing color and the bones changing color based on the average color of the joint + its parent:

(keep in mind that the skeletons are displayed every 25 frames right now...)