Ubreak 'all time' range.
Remove axis from per-category charts.

Evenly-placed ticks prove to be more confusing than helpful. In
future, I'll add sorting categories by value, and showing percentages.
Cleanup API.
Implement clearing of filters for category charts.
Implement error reporting.
Infer template name from script's path.
Rename View.charts to View.timelineCharts.
Regenerate distribution.
Merge branch 'master' into gh-pages
Update webpage to directly show the demo.
Add link click tracking.