Mimic ggvis

[tshort]

Maybe following the API of ggvis would be better than following ggplot.

I haven't gotten it to run on my machine, yet, but from the looks of the API, it should fit well with Vega. Hadley certainly seems to be cranking away at it.

[johnmyleswhite]

That's a great idea. I didn't realize Hadley was so busy with this project.

I can run some of the ggvis examples on my machine, but it's erratic. Trying to follow this API seems like a good idea. My one concern is to avoid competing with Gadfly too much.