[ogsa-wg] Updated Express AuthN Profile docs

[Duane Merrill]

All, I've updated the three EAP security profile documents on Gridforge 
with some minor revisions, including clarifications, fixes to 
requirement-numbering inconsistencies, and added an example SOAP message 
meeting the requirements of the X.509 message-level binding assertion 
policy.

A question for the group: Would it be a good idea to also profile a 
Kerberos message-level binding assertion policy within the 
OGSA-SP-SecureSoapMessaging profile?  The document currently profiles 
X.509 and UsernameToken binding policies, primarily because of their 
widespread use / ease-of-adoption.  Thoughts?

Duane