`.jsx` linting is now in-scope for the `npm run lint` command, and
I linted the base files and some of the viz, there's still quite a bit
of work there, but that's a first pass on it.
* Refactor around how visualizations/*.js are required
* Reactifying FilterBox further
* Fixing the auto-refresh on filtering events
* Fixing preselected filters
* Periodically update the slices in the dashboard
* Make the refresh interval changeable
* Add the button and the modal for the user to change the refresh interval
* Don't use callback for refreshing
* Randomize to prevent all widgets refreshing at the same time
* Show the loading icon as an overlay when the slices refresh