Now adding events to category and neighborhood objects.
Replaced eventCount with events.count
Merged colin's latest.
WIP removing old vars.
Finished removing old vars. Fixes #4.
Cleaned code in event layer.
WIP neighborhoodStats/
Added neighborhood stats to neighborhood obj. Not perfect, but close.
Finished adding category stats too, with tests in citizenData.
Removed dev test code.
neighborhood centroid pulsates based on number of events