Ensure Request emits initial Response data as string

Author: mmelvin0

src/Request.php

@@ -156,7 +156,7 @@ public function handleData($data)
 
             $this->emit('response', array($response, $this));
 
-            $response->emit('data', array($bodyChunk, $response));
+            $response->emit('data', array((string)$bodyChunk, $response));
         }
     }
 

tests/RequestTest.php

@@ -73,7 +73,7 @@ public function requestShouldBindToStreamEventsAndUseconnector()
 
         $response->expects($this->once())
             ->method('emit')
-            ->with('data', array('body', $response));
+            ->with('data', $this->identicalTo(array('body', $response)));
 
         $response->expects($this->at(0))
             ->method('on')