Should be able to take a public quiz without subscribing

[GoogleCodeExporter]

Subscribing to a quiz just puts it in your 'subscribed quizzes' list on the
main page. There's no technical reason you need to subscribe to a quiz in
order to take it, so we should allow users to take a public quiz without
subscribing. Sessions and responses would still be stored, but these only
become accessible once the user subscribes to the quiz. 

Original issue reported on code.google.com by [email protected] on 17 Aug 2008 at 12:27