Changing order for DomElement.get_elements_by_class_name()
Changing order for DomElement.get_elements_by_class_name()

* Now first add it self before to add descendant nodes
* Fixed too order for DomElement.get_elements_by_tag_name_ns()

GNOME/gxml,GNOME/gxml,GNOME/gxml,GNOME/gxml