Upgrading phpCAS to version 1.3.3
Fixing plugin to work with phpCAS 1.3.3
Merge pull request #6 from gaudreaj/phpcas_133_migration

phpCAS 1.3.3 migration due to security issues

Since I am now retired and do not have anymore access to my Institution Mahara's and CAS servers, I have to trust you. 

Cheers.