add support for empty geometries
add support for multipoint geometries
clean up support for point geometries
add support for polyline and polygon geometries
add support for envelope geometries (as polygon with bounding box)
return null coordinates for empty geometries
Merge branch 'master' of git://github.com/Esri/geometry-api-java into geojson_export
add GeometryEngine#geometryToGeoJson and OGCGeometry#asGeoJson (with tests)
add proper multipolygon support
add Apache license headers
Merge pull request #8 from scooterw/geojson_export

Add GeoJSON export ...