Feature request: color labels for categories

[davemcg]

Like this: http://stackoverflow.com/questions/20901915/change-the-layout-of-heatmap-2-figure

Ideally would be able to stack a few (3 or 4?) on top of each other. Options for col or row axis.

[rlbarter]

There have been many requests for this feature -- it's one of the ones at the top of my list :).