Split iPhone and iPod devices

I have a method like this:

```php
    public function getDevice()
    {
        if (is_null($this->_device)) {
            foreach (self::getPhoneDevices() + self::getTabletDevices() as $key => $rule) {
                if ($this->match($rule)) {
                    $this->_device = $key;
                    break;
                }
            }
        }

        return $this->_device;
    }
```

With this patch I can correctly detect iPod now.