src/http-parser: Allow custom HTTP-version string (e.g., ICY)
src/http-parser: Allow custom HTTP-version string (e.g., ICY)

We need HTTP major and minor version later, so we assume it is
HTTP/1.0 equivalent if custom HTTP-version string is used.

tatsuhiro-t/spdylay,mixianghang/spdylay,mixianghang/spdylay,ahnan4arch/spdylay,mixianghang/spdylay,tatsuhiro-t/spdylay,ahnan4arch/spdylay,mixianghang/spdylay,tatsuhiro-t/spdylay,ahnan4arch/spdylay,mixianghang/spdylay,tatsuhiro-t/spdylay,tatsuhiro-t/spdylay,ahnan4arch/spdylay,ahnan4arch/spdylay