Add reading Feature properties to GeoJsonReader

[mipastgt]

The current GeoJsonReader can import a whole FeatureCollection but it is difficult to later identify each Feature by its geometry. I think it would be very helpful to add the properties of a Feature as user data to the Feature geometry. For my own purposes I had to modify just one method in the current GeoJsonReader to achieve that.

  private Geometry createFeature(Map<String, Object> geometryMap, GeometryFactory geometryFactory)
      throws ParseException {
      try {
          @SuppressWarnings("unchecked")
          Map<String, Object> innerGeometryMap = (Map<String, Object>) geometryMap.get(GeoJsonConstants.NAME_GEOMETRY);
          @SuppressWarnings("unchecked")
          Map<String, Object> properties = (Map<String, Object>) geometryMap.get(GeoJsonConstants.NAME_PROPERTIES);
          Geometry geometry = create(innerGeometryMap, geometryFactory);
          geometry.setUserData(properties);
          return geometry;
      } catch (RuntimeException e) {
          throw new ParseException("Could not parse Feature from GeoJson string.", e);
      }
  }

It would be nice if this could be added to the official GeoJsonReader.