use a better colorwheel?

[pljakobs]

The current (farbtastic/jquery) colorwheel is unintuitive since it does not present the hsv colorspace intuitively. The value for 100% saturation and 100% brightness is not assigned to one of the corners of the square but sits at x=0, y=50% with everything going up from that reducing saturation again until at y=100% it reaches 0 and value remains at 100%. The html5 colorpicker presented here seems more natural and intuitive.