Bubble Chart for issue #68

[drabelpdx]

Here is a bubble chart. I've striped out most of the data/project specific code to the utils.js file. I hope David Daniel can tell me where this file should live in a project. Then I can go back and edit the address for those that need to reach it. Also, it currently has two categories to sort by, but can add more. Might refactor to map over multiple categories for BubbleChart.js and GroupingPicker.js if needed.