Session: Clear attributes on logout.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@766 44740490-163a-0410-bde0-09ae8108e29a

lib/SimpleSAML/Session.php

@@ -332,6 +332,7 @@ class SimpleSAML_Session {
 
 		$this->authenticated = FALSE;
 		$this->authority = NULL;
+		$this->attributes = NULL;
 	}