Another dumb-mode PHP consumer demo

[Alan J Castonguay]

I've finished putting together a dumb-mode consumer demo in php. Still
need to clean up the class' interface. Ugly source available.

 http://verselogic.net/openid/guestbook.php

It's working with livejournal as an oid server, I would appreciate
people testing it with other servers. C&C welcome.

In particular, should the consumer ever be running a
base64(hmac(secret,data)) call, or just handing the data verbatim back
to the OpenID server? I am currently doing the former, but I'm afraid
I have little understanding of why.

Alan J Castonguay