allow additional status codes through constructor

It is currently possible to possible to trigger a CakeException by passing in an unsupported status code into the constructor.  This allows for additional status codes to be set (through $options['codes']).  While this is largely syntactic sugar, it can potentially prevent an exception.

Assuming we are inside of a class declaration, $object is an class instance, and $extraCodes is an object attribute, 

	public function __construct($object) {
		$this->httpCodes($this->extraCodes);
		parent::__construct(
			'status' => $object->getStatusCode(),
			// etc ...
		);
	}

would turn into ...

	public function __construct($object) {
		parent::__construct(
			'status' => $object->getStatusCode(),
			'codes' => $this->extraCodes,
			// etc ...
		);
	}

My current usage is that I am trying to build a CakeResponse from a different object (Adapter pattern) that can have a status code not in CakeResponse::$_statusCodes.  It's not ground-breaking and I could totally do without it.  But I think the second form follows a more functional style and thus is a little more concise than the first.