Add support for 3d points in GeoJson #1704
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This PR allows GeoTrellis to read GeoJson with 3-dimensional coordinate information by adopting the approach of throwing out the z-coordinate. Smarter handling of elevation data will require a more thorough approach, requiring a new Geometry subclass with z-coordinate capabilities, which would necessarily percolate out into the rest of the library.
This PR closes issues #1272.