Use socket.setNoDelay( true ) on sockets

[FabianEmmes]

Under some circumstances, nodejs HTTP Replies are delayed (by about 40ms on Linux) uneededly by Nagle's Algorithm. It would probably be better to solve this upstream, i.e., in the connect server.

The following is a fix, but depends on #94. It can easily be backported though.

      // Depending on the request, connect/nodejs write the http header and
      // body separately. Set TCP_NODELAY to avoid delays in such situations.
      middlewares.push( function( req, res, next ) {
         req.socket.setNoDelay( true );
         next();
      } );