Op_code and version negotiation

[Ben Hyde]

Two suggestions regarding the design of the exchanges with the end 
point found via the openid.server server link.

First off I'd suggest included now a way to support more than the one 
operation currently done via that end point; i.e. a openid.op argument.

Second I'd suggest adding a protocol version indicator in the messages 
sent to the end point.   Complementing that I'd suggest adding to the 
end point two optional arguments openid.minver (defaults to 1) and 
openid.maxver (defaults to the value of minver).

These two additions ought to enable a lot more flexibility over time.   
For example a later version might support retrieving the user's FOAF, 
or submitting a 'looks like spam' note.

    - ben

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