Add Font Awesome.
Update load() function so it can handle re-loading the chart data and transitioning to a new aggregate level.
Work on toggle button to switch between Hour/Day aggregate levels.
Don't forget to adjust bar x and width on transition.
Fix transitions on ticks and bars.
Remove log statement; fix documentation comment.
Support Month level aggregation.
Work on adding vertical rules and "aggregate bands" to represent the seasons. Needs more work.