getService() deprecated and bootstrap "hide" class collision fix

getService() is formally deprecated, so for now its better to use getContext()->getService()
getContext() is not yet formally deprecated - more info (cs): http://phpfashion.com/prejdete-na-nette-2-1#comment-20571

+ class "hide" collided with twitter bootstrap hide and wasnt possible to toggle the elements, so i used "nette-collapsed" class instead