Add CAS logout button plugin

This plugin adds a button to allow users to logout from their CAS session.

In order for the plugin to work, you'll have to:

enable your CAS connection to display this button.
configure your CAS connection to have the button works.
go to Administration > Configuration settings > CAS and follow the instructions.

This plugin has been made to be added in the login_top region, but you can put it wherever you want.