Replicate "end" event from connection to input

Fixes friends-of-reactphp#24 without throwing exception as in friends-of-reactphp#25

src/React/Stomp/Factory.php

@@ -43,6 +43,10 @@ public function createClient(array $options = array())
             $input->emit('error', array($e));
         });
 
+        $conn->on('end', function ($e) use ($input) {
+            $input->emit('end', array($e));
+        });
+
         return new Client($this->loop, $input, $output, $options);
     }