Adds unit tests for QDomDocument class.
Adds unit tests for QDomDocument class.

Reviewed by Hugo Parente <hugo.lima@openbossa.org>
Reviewed by Lauro Moura <lauro.neto@openbossa.org>

pankajp/pyside,PySide/PySide,PySide/PySide,BadSingleton/pyside2,BadSingleton/pyside2,RobinD42/pyside,M4rtinK/pyside-bb10,M4rtinK/pyside-bb10,gbaty/pyside2,pankajp/pyside,qtproject/pyside-pyside,RobinD42/pyside,BadSingleton/pyside2,enthought/pyside,enthought/pyside,enthought/pyside,IronManMark20/pyside2,IronManMark20/pyside2,qtproject/pyside-pyside,IronManMark20/pyside2,RobinD42/pyside,enthought/pyside,pankajp/pyside,qtproject/pyside-pyside,IronManMark20/pyside2,M4rtinK/pyside-bb10,M4rtinK/pyside-android,gbaty/pyside2,pankajp/pyside,RobinD42/pyside,M4rtinK/pyside-bb10,M4rtinK/pyside-bb10,enthought/pyside,M4rtinK/pyside-android,M4rtinK/pyside-android,enthought/pyside,M4rtinK/pyside-bb10,pankajp/pyside,IronManMark20/pyside2,enthought/pyside,M4rtinK/pyside-android,M4rtinK/pyside-android,gbaty/pyside2,gbaty/pyside2,PySide/PySide,RobinD42/pyside,gbaty/pyside2,RobinD42/pyside,PySide/PySide,PySide/PySide,BadSingleton/pyside2,qtproject/pyside-pyside,M4rtinK/pyside-android,BadSingleton/pyside2,RobinD42/pyside,qtproject/pyside-pyside