trying out d3

Two things:
  - We aren't actually adding any text yet. You can use [`.text`](https://github.com/mbostock/d3/wiki/Selections#text) to do that. 
  - We probably don't need to position the text this way, each `<text>` will be positioned along with each `<circle>` (since each are part of the same `<g>`). We might need to position the text inside the circle to make it fit nicer, but that's less important.