Releases for CAS roles

Issue #2241985: retain regular expression if a role is saved but the name didn't change
Issue #2271597: make attributes case insensitive
Issue #2328123: Fix spelling mistake in module description.
Issue #2489844: Add tests

Some things changed with this version!
Especially if you exported the role mapping with features.

• Change the role mapping to use role names instead of ids (like features 2).
• Add option to deny login if no regex matches.
• Fixing the code so that the module doesn't break when un-configured.
• Adding documentation to README.
• Replacing system tokens and remove missing tokens.
• Fix bug when new role is added.

Release of first version for drupal 6