[OGSA-AUTHZ] new version of 'Use of SAML to retrieve Authorization Credentials'

I've uploaded a revised version of 'Use of SAML to retrieve Authorization Credentials' at https://forge.gridforum.org/sf/docman/do/viewDocument/projects.ogsa-authz/do... This integrates the answers to the comments received during the public comment period, details here https://forge.gridforum.org/sf/wiki/do/viewPage/projects.ogsa-authz/wiki/Ans... Regards, Valerio