Fix reporting Parser Exceptions for PHP 5.3

Author: clue

src/Client.php

@@ -32,7 +32,7 @@ public function __construct(StreamInterface $stream, Parser $parser = null)
             try {
                 $messages = $parser->push($chunk);
             } catch (UnexpectedValueException $e) {
-                $that->emit('error', array($e, $this));
+                $that->emit('error', array($e, $that));
                 return;
             }