Add kml xmlns if no namespace/prefix is used for kml

 add the ability to add untyped extended data / name value pairs 
thanks :)

Tuple Assignment Issue in kml.py Fixed

use pygeoifs feature collection instead of shapelys, add support for mixed shapely - pygeoif geometries for GeometryCollections

move geometries out of kml.Placemark int geometry.Geometry, add tests. The Tests for GeometryCollection fail if shapely is installed, waiting for guidance how to handle GeometryCollections with shapely