`4.3.0`.

November 13th, 2017

* tacopie: fork support: allow set_default_io_service to take nullptr. In order to safely fork, call set_default_io_service(nullptr) to make sure the io_service destructor is called and all underlying threads joined.

* tacopie: fix: timeout for connection not working due to invalid param to select, now working

* tacopie: improvement: make sure socket is in blocking mode before connection (#32) as it differs from one OS to another

* tacopie: improvement: check for non-blocking connect errors with getsockopt to avoid connect reporting a successful connection followed by a call to disconnection handler (now connect report a failed

* tacopie: ipv6 support (connect, bind and accept operations, on tcp_server and tcp_client)

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