shrpx: Send acceptable list of CAs when client cert auth is enabled
src: Call SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN)
spdycat: Fix port checking to share connection
shrpx: Call SpdySession::disconnect() if initiate_connection() failed

This will clean up resources allocated in initiate_connection()
properly.
spdycat: Don't call abort() when server does not advertise SPDY protocol
Merge branch 'master' of https://github.com/irrenhaus/spdylay into irrenhaus-master
shrpx: Add --client-private-key-file and --client-cert-file options
shrpx: Disable TLS renegotiation
shrpx: Disable TLS renegotiation properly

1509c90 does not disable TLS renegotiation at all, if client keeps
rengotiations without sending application data. In this change, we
intercept the raw incoming data from the client and if it is a
renegotiation, drop the connection immediately.
shrpx: Take into account both frontend buffer and body buffer length
shrpx: Rename ClientHandler::get_pending_write_length to get_outbuf_leng

 other renames.
shrpx: Move backend outbuf threshold to each downstream type
shrpx: Remove deprecated evbuffer_setcb, send WU before buffer gets empty
src: Use static_cast instead of reinterpret_cast if possible
shrpx: Call upstream_writecb when underlying bufferevent buffer gets empty
Update NEWS
Bump up version number to 1.2.3, LT revision to 7:1:2
Update README.rst
Update sphinx_rtd_theme
Bump up version number to 1.2.4-DEV