v0.7.0

• Feature / BC break: Add main Connector facade
  (#93 by @clue)

  The new Connector class acts as a facade for all underlying connectors,
  which are now marked as "advanced usage", but continue to work unchanged.
  This now makes it trivially easy to create plaintext TCP/IP, secure TLS and
  Unix domain socket (UDS) connection streams simply like this:

  $connector = new Connector($loop);
  
  $connector->connect('tls://google.com:443')->then(function (ConnectionInterface $conn) {
      $conn->write("GET / HTTP/1.0\r\n\r\n");
  });

  Optionally, it accepts options to configure all underlying connectors, such
  as using a custom DNS setup, timeout values and disabling certain protocols
  and much more. See the README for more details.