SimpleSAML_XML_Shib13_AuthnResponse: Remove inheritance of SimpleSAML_XML_AuthnResponse.
SimpleSAML_XML_Shib13_AuthnResponse: Remove inheritance of SimpleSAML_XML_AuthnResponse.

rchavik/simplesamlphp,rchavik/simplesamlphp,rchavik/simplesamlphp,rchavik/simplesamlphp