cas 5.x-4.x-dev

This is a dev release for code and bug fixes that will be included inthe 5.x.4 release

* CAS Single sign-out support #288408: CAS Single Sign Out/Off
* Abiltity to initialize cas a proxy provider #303373: Initialize CAS as proxy
* CAS Server Lite #396920: CAS Server Module (Not fully featured yet)
* Allow Users to put <front> to redirect to front page #255086: Allow users to put <front> to redirect to frontpage on logout.
* Compatibility with persistent_login #384756: Compatibility with Persistent Login
* Compatibility with Login Redirect #454456: CAS and Login Redirect

Also contains bug fixes

* Please do not randomize my password #258909: Please do not randomize my password on every login
* Blocked users can still login #180608: Blocked users can still login