[hybi] -05: Overly restrictive with "Connection"

["Pat McManus @Mozilla" <[e-mail]>]

In client requirements (5.1), under handshake requirement #6: 
"The request MUST contain a "Connection" header whose value is equal to
"Upgrade"."

I believe that should be changed to "whose value contains the Upgrade
token" instead of the "equal" language. As currently written it
prohibits the client from concurrently using the Connection header for
other valid HTTP/1.1 purposes too, and we want to make this HTTP/1.1
compatible.

Similarly:

 "If the response lacks a Connection header or the Connection header
contains a value that is not an ASCII case-insensitive match for the
value "Upgrade", the client MUST fail the WebSocket connection." 

Again, we require an upgrade token but its ok to have other values in
there too.. in order to be http compatible we must loosen this receive
condition, and we ought to loosen the send one too.


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