basic formatting and script imports

This is mostly to expose you to the idea of a pull request, but also I made it so you have a bit more of a responsive program for testing. If you use Google Chrome, hit Alt + Command + J for the javascript console, where you can type "drawGroup([[],[0,1,2]])" and your circles will be drawn... Or will they? You may have to make d3 erase the current circles before drawing the new ones. Anyway, really doing my best not to be too opinionated, just trying to be helpful and enthusiastic.