More Complete, but Basic Example

[Darryl Agostinelli]

The current example shows us how to use flask_saml using flask_principal. How about just showing how to use it without flask_principal? I think it's great that you've proposed that extra framework, but I think it's helpful to show how to use this without that as well.

Also, in a real production use-case, we are going to need a bit more to the application. For instance, in a larger app, we have Blueprints and we have some end points that need security and others that do not. For instance, a login_required decorator is needed (or something similar). Please show that in the basic example.