Crash Mapper issue 97 - Map and Chart cross-links

[gregallensworth]

https://github.com/GreenInfo-Network/nyc-crash-mapper/issues/97

The chart app and map app have totally different ideas of identifying polygonal areas: identifier for the Map (the unique name/ID, e.g. 23) and primary for the Chart (a unique but verbose string e.g. Bronx, NYPD Precinct 123) As a result, the Map links from Chart and the 3 Chart links from Map don't work as expected: they load the expected area type, but not the specific area and its data.

This PR will fix this, so the cross-links work properly.

• Coming from any chart to the Map, the data are filtered to the area and the map zooms to the area.
• Coming from the Map to any of the chart links, the area will be selected and data displayed.

[gregallensworth]

There are changes to both the Chart and Map apps here, and they should both be merged and deployed at the same time.

https://github.com/GreenInfo-Network/nyc-crash-mapper/pull/98 https://github.com/GreenInfo-Network/nyc-crash-mapper-chart-view/pull/107