With --client-proxy option, shrpx makes sure that the request path is
an absolute URI, otherwise it will return 400 status code.

With --client-mode option, shrpx now accepts unencrypted HTTP
connections and communicates with backend server in SPDY.  In short,
this is the "reversed" operation mode against normal mode.  This may
be useful for testing purpose because it can sit between HTTP client
and shrpx "normal" mode.

To distinguish the to-be-installed programs and non-installable
example source code, the former programs, spdycat, spdydyd and shrpx,
were moved to src directory. spdynative was removed from Makefile
because it does not appeal to any users much.

By default, configuration file is /etc/shrpx/shrpx.conf.  It can be
overridden using --conf option. See shrpx.conf.sample to know how to
write shrpx.conf. The configurations given in shrpx.conf will be
overridden by the options specified in cmmand-line.

--pid-file option saves PID to the specified file.  user option is
--used to drop root privileges.

This option append X-Forwarded-For header field to the downstream
request.

To enable SPDY proxy, use --spdy-proxy option.  At time of this
writing, the only browser which supports SSL/SPDY proxy is Chrome.

Removed Location and Host header field rewrite.

Put libhtparse in examples/htparse