v1.5.0

• Feature: Update Browser signature to take optional $connector as first argument and
  to match new Socket API without nullable loop arguments.
  (#418 and #419 by @clue)

  // unchanged
  $browser = new React\Http\Browser();
  
  // deprecated
  $browser = new React\Http\Browser(null, $connector);
  $browser = new React\Http\Browser($loop, $connector);
  
  // new
  $browser = new React\Http\Browser($connector);
  $browser = new React\Http\Browser($connector, $loop);

• Feature: Rename Server to HttpServer to avoid class name collisions and
  to avoid any ambiguities with regards to the new SocketServer API.
  (#417 and #419 by @clue)

  // deprecated
  $server = new React\Http\Server($handler);
  $server->listen(new React\Socket\Server(8080));
  
  // new
  $http = new React\Http\HttpServer($handler);
  $http->listen(new React\Socket\SocketServer('127.0.0.1:8080'));