Added missing constructor parameter

Is someone working on the cookie stuff? If I understand it correct, Zend\Http\Cookie and Zend\Http\Client\Cookie should handle <code>Header\Cookie</code> and <code>Header\SetCookie</code> - but it looks like there are a few copy & paste issues here. 

E.g. [this](https://github.com/zendframework/zf2/blob/develop/library/Zend/Http/Client/Cookies.php#L107) will always fail:

```php
if ($cookie instanceof Cookie) {
        $domain = $cookie->getDomain();
        $path = $cookie->getPath();
        if (!isset($this->cookies[$domain])) {
            $this->cookies[$domain] = array();
        }
        if (!isset($this->cookies[$domain][$path])) {
            $this->cookies[$domain][$path] = array();
        }
        $this->cookies[$domain][$path][$cookie->getName()] = $cookie;
        $this->rawCookies[] = $cookie;
} else {
        throw new Exception\InvalidArgumentException('Supplient argument is not a valid cookie string or object');
}
```



Cause Cookie does not have the method <code>getDomain</code> (same with <code>getPath</code>) - but <code>SetCookie</code> has that method. From the [internal architecture](https://github.com/zendframework/zf2/blob/develop/library/Zend/Http/Client/Cookies.php#L115) I guess <code>Cookie</code> needs this method.