Add an option to allow for case insensitive matching of username

[GoogleCodeExporter]

What steps will reproduce the problem?
1. create a user such as username [email protected]
2. login with SAML under auto_create and have the SAML provider return 
[email protected]
3. You will see that a second user is created and lots of things might go wrong 
in the password base authentication backend of the app if the authentication 
backend is customized to treat username as case insensitive (majority of django 
apps are probably like this!)

We need an option that would allow case insensitive lookup, e.g. 
Users.object.get_or_create(username__iexact=username) vs 
...get_or_create(username=username) to

Original issue reported on code.google.com by [email protected] on 12 Jun 2013 at 4:32

[GoogleCodeExporter]

Sorry, I stupidly added this under -idp instead of -sp! Can somebody close this 
issue pls?

Original comment by [email protected] on 12 Jun 2013 at 4:35

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