Serve "videos" in random order
Add gaesessions package

From https://github.com/dound/gae-sessions/
Per http://blog.stannard.net.au/2011/01/09/how-to-use-sessions-on-google-app-engine-with-python-and-gae-sessions/
Wire up gaesessions

Per http://blog.stannard.net.au/2011/01/09/how-to-use-sessions-on-google-app-engine-with-python-and-gae-sessions/
Demo use of gaesessions
Each reload consumes 2 choices from session playlist