Update to the versions required adding in the servlet dependency
Updated to match the Unicon version in the cas-overlay project. 
Removed reference to a class that no longer is part of CAS-ADDONS
Updated to recent versions of CAS, CAS-ADDONS, SPRING, JODA-TIME
Updated to build a clean war artifact without multiple versions of jars
Merge pull request #56 from Unicon/version-updates

Version updates