SAML2/SOAPClient: Allow other message types than SAML2_ArtifactResolve.
SAML2/SOAPClient: Allow other message types than SAML2_ArtifactResolve.

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