Adds PySide support.
Adds missing sys import and comments.
Fixes silly mistake.
adding new module to handle different qt python bindings, pyside and pyqt4.
i modifed this module to include work from another module python_qt_binding by
Dirk Thomas, Dorian Scholz, TU Darmstadt
modified files to use new python qt binding abstraction module.
must add plugin to sys path at the top of the module, so we can import Qt.