First attempt at WSF_HTTP_PROTOCOL_VERSION

I decided to just limit it to the HTTP specification for now. The header comment for WSF_REQUEST.server_protocol appears to be from a CGI specificiation, but the only draft of version 1.1 that I could find does not have extension tokens. In any case, I'm not sure where that should be tackled.

So for now I have just used it in place of the is_http_1_0 routine. Take it from there.