consider retiring geojson-google-maps

[thecristen]

As noted on that repo, Google Maps API now supports GeoJSON.

[carpeliam]

I looked into this a little bit, due to #60. It seems like the way to do this is to create a new google.maps.Data object, and add GeoJSON data to that. Unfortunately, that returns a google.maps.data.Polygon object, which isn't the same as a google.maps.Polygon object (which is super annoying, Google, seriously). Google's functionality to detect if a point is within a polygon works with a google.maps.Polygon, not a google.maps.data.Polygon, and while some people have been able to write code to translate, this seems super sketchy and brittle. Meh. :/ Maybe there's another way?

[moczka]

@carpeliam is file maps.google.polygon.containsLatLng.js extension in folder /vendor meant to be used to possibly fix this issue? If so, should I start implementing this extension on all the modules that use GeoJson to finally remove our dependency on it?