Fix wrong feedback token length.

This pull request is about to fix wrong feedback token length.

In real sandbox environment I get 32bit token from feedback().

array (size=1)
  0 =>
    object(ZendService\Apple\Apns\Response\Feedback)[5]
        protected 'token' => string '8c73d887c40dc5e581a96cc379906b08' (length=32)
        protected 'time' => int 1420642410

So I add var_dump() in ZendService\Apple\Apns\Response\Feedback.

public function parseRawResponse($rawResponse)
{
  $rawResponse = trim($rawResponse);
  $token = unpack('Ntime/nlength/H*token', $rawResponse);

  var_dump($token);

  $this->setTime($token['time']);
  $this->setToken(substr($token['token'], 0, $token['length']));

  return $this;
}

And I get this response.

array (size=3)
  'time' => int 1420642410
  'length' => int 32
  'token' => string '8c73d887c40dc5e581a96cc379906b0835c6d7f3d182e4f67b11d2db6e9ba947' (length=64)

After I read the apple apns document, I found this.

Type	description
Timestamp	A timestamp (as a four-byte time_t value) indicating when APNs determined that the app no longer exists on the device. This value, which is in network order, represents the seconds since 12:00 midnight on January 1, 1970 UTC.
Token length	The length of the device token as a two-byte integer value in network order.
Device token	The device token in binary format.

This length is for token in bytes, and 1 byte will comes 2 length of string in php, so this length should be multiply by 2.

zendframework / ZendService_Apple_Apns

Fix wrong feedback token length. #20