Pedestrian safety

[henrykaplan]

• Add optional parameter to mapillary wrapper client to allow data requests of recent data only, to quickly update existing datasets.
• Better maps and visualizations.
• Use DBScan clustering algorithm to find clusters of traffic accidents (simplest way to roughly group accidents at specific intersections, as the accident data is mostly based around intersections).
• Updated report ppt for August 5 presentation to data science group