First run at multiple voices. For some reason they won't stop playing at the end.
Rename source file to match the convention.
Adds top users time-of-day polar plots.

Abstracts scale_x_tod for reuse in various plot explorations.
Remove old top_user_tod png.
Fix never-ending tone problem
Map style; R package build and manual; Minor sound changes.

The mapbox map is now using my ver basically styles white map. We're
displaying neighborhoods by colors, according to the number if posts
in each. Neighborhoods for which we don't have any data are being
displayed in white, as are areas outside of NYC.

I reverted the sound, re-introducing the infinite play bug. I'll
work on fixing that next.

The R package had some build issues, which should be resolved. I've
also introduced additional neighborhood stats JSON dumps.