Revert "Clean up annoying 5.3 $that = $this"

This reverts commit a16505d.

Author: clue

src/Server.php

@@ -30,14 +30,16 @@ public function listen($port, $host = '127.0.0.1')
         }
         stream_set_blocking($this->master, 0);
 
-        $this->loop->addReadStream($this->master, function ($master) {
+        $that = $this;
+
+        $this->loop->addReadStream($this->master, function ($master) use ($that) {
             $newSocket = stream_socket_accept($master);
             if (false === $newSocket) {
-                $this->emit('error', array(new \RuntimeException('Error accepting new connection')));
+                $that->emit('error', array(new \RuntimeException('Error accepting new connection')));
 
                 return;
             }
-            $this->handleConnection($newSocket);
+            $that->handleConnection($newSocket);
         });
     }