Adding debug mode for Shibboleth AuthnResponse. If you turn on the debug option in config.php you will now get the web page showing the authnresponse, as it earlier did with SAML 2.0

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@169 44740490-163a-0410-bde0-09ae8108e29a