added getWikiVertical function for wiki/vertical metadata

> print_r($h->getWikiVertical(13));
Array
(
    [id] => 5
    [name] => Lifestyle
    [url] => http://lifestylehub.wikia.com/
    [short] => lifestyle
)
> print_r($h->getWikiVertical(13)["name"]);
Lifestyle

@gabrys