Gave pyvis a version number and a docstring. Also do not import opengl subpackage by default.
Pyvis should probably not import it by default. Additionallt, it needs pygly, which
does not run on py3k.
Made pyvis work on py3k (mostly fixing imports). Made fsaa demo work on qt Canvas!
Added App class. A backend should now implement a CanvasBackend and a AppBackend class.
These two should be separated, because there is one app, and there can be
multiple windows. Also, the app object allows things like process pending events.
Added rudimentary key event to Qt. fsaa demo uses it.
Merge
Added app.quit
Merge (again) my first merge conflict in git
not sure if i am doing it right.
Merge branch 'master' of https://github.com/pyvis/pyvis

Conflicts:
	pyvis/canvas/backends/qt.py