CLC-3917 - Added cmdline script for Canvas CaS Authorization URL refresh job
CLC-3917 - Added Canvas rake task to perform CAS authentication reconfiguration
CLC-3917 - Added Canvas::ReconfigureAuthorizationConfigs
CLC-3917 - Added Canvas::AuthorizationConfigs proxy
CLC-3917 - Updated opening output message for External LTI application refresh script
Merge pull request #3112 from redconfetti/CLC-3917-cas-server-url-script

CLC-3917 - Create script to update CAS Server URL for Canvas Beta and Test