Geojson

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- Fix tests by including test file into build

- https://github.com/jazzband/geojson/issues/61

- Build universal wheels

- https://packaging.python.org/en/latest/distributing.html#universal-wheels

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- Encode long types correctly with Python 2.x

- https://github.com/jazzband/geojson/pull/57

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- Utility function to validate GeoJSON objects

- https://github.com/jazzband/geojson/pull/56

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- Stop outputting invalid GeoJSON value id=null on Features

- https://github.com/jazzband/geojson/pull/53

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- Fix bug where unicode/non-string properties with a 'type' key cause a crash

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- Fix bug where unicode keys don't get decoded properly
- Add coords and map_coords utilities