Graphistry Timebar

This is a simple react component which renders a histogram as prepared by the graphistry server.

To see this run, type npm install && npm run dev and it should open in your browser.

It takes four props:
1. bins is a normalized set of bins. See example/app.js to see how bins are set.
2. onSelect is fired every time the component's selection changes. The payload is an array of selected bins. Again, see example/app.js to see it work.
3. onZoom is fired every time the user uses the scrollwheel/two-finger-touch on the timebar. It actually gets the zoom event, and one outstanding unit of work is to wire up that event to our falcor server.
4. onHighlight is fired every time the user mouses over or out of a bar. It is called with the bin index to highlight.

Currently there's an issue with react versions when using this in viz-app.

To use in viz-app, make sure vizapp/packages/viz-app/package.json has the correct version for @graphistry/timebar. You'll find the timebar component wired up in /viz-app/packages/viz-app/src/containers/timebar/components/timebar.js. The onZoom, onSelect and onHighlight functions are wired up.

The problem right now is that the selection area when you click+drag isn't mapping to actual position because the way that I'm getting bounds (in src/index.js in this repo, tagged with a comment at the top) seems to be breaking in viz-app (I think due to version mismatch).