- use six.moves for cStringIO
- make six import absolute
- make six import absolute
Merge branch 'stringio' of github.com:wernerfb/Phoenix into stringio

Conflicts:
	demo/AUI_DockingWindowMgr.py
	demo/ArtProvider.py
	demo/ImageFromStream.py
	demo/Main.py
	demo/agw/FoldPanelBar.py
	demo/agw/HyperTreeList.py