Suggestion: Consider gganimate support

[henningsway]

Just another idea! Since the plots are created via ggplot, I think it could be really interesting to use gganimate or similar to prepare stepwise animations of a tree unfolding.

I think this could be really cool, when communicating the implications of a tree to others. Ideally a tree would unfold per keypress or so similar to: http://www.r2d3.us/visual-intro-to-machine-learning-part-1/ (Scroll down to "Growing a tree").

Let me know, if there is sth I could help with.