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.

CONNECT method supported. Fixed _str8cmp and _str9cmp comparison.
Support no content-length case.  Fixed hook_uri_run args. Run
hook_on_hdrs_complete if no header field is present. Supported empty
header value. Case insensitive match for particular header values
(e.g., keep-alive).

Signed-off-by: Piotr Sikora <piotr.sikora@frickle.com>

Removed Downstream::force_resume_read() calls.  Added missing delete
downstream in shrpx_spdy_upstream.cc.  In on_stream_close_callback,
delete downstream even if response state != MSG_COMPLETE. This may
cause segmentaiton fault.

If it is enabled, turn on extra compiler warnings.

stream was closed or being closed.

Reset status = 0 when entering s_status state in htparse_run