SAML20_AuthnResponse: Add getStatus() function.
SAML20_AuthnResponse: Add getStatus() function.

Add a getStatus() function, which retrieves the status code of the
response as a sspmod_saml2_Error object.

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