Merge pull request #2 from HaToHo/master

Added a cas authentication module.
Merge pull request #3 from HaToHo/master

Added extra validation for CAS module.
Added some functionality
Fixed tests
Extra checks.
Improved functionality
Merge branch 'master' of github.com:rohe/pyoidc
Dynamically created files
To use the same method format as the super class.
fixed some problems
Use one cookie method
Constructed authn arguments in one place.
Still versions that can't do list comprehension.
Don't import unless needed.
Might get None
Merge with master upstream
Merge med master