code: protected void writeBbox(JsonGenerator jgen, T shape, SerializerProvider provider)
              throws IOException {
          double[] coordinates = getBboxCoordinates(jgen, shape, provider);
          if (coordinates != null) {
              jgen.writeFieldName("bbox");
              jgen.writeObject(coordinates);
          }
      }
docs: Adds the bbox parameter to the geojson string, as defined by the <a href="http://geojson.org/geojson-spec.html">
  GeoJSON specification</a>
  
  @param jgen  the jsongenerator used for the geojson construction
  @param shape the geometry for which the contents is to be retrieved
  @param provider provider to retrieve other serializers (for recursion)
  @throws java.io.IOException If the underlying jsongenerator fails writing the contents