Entity: fixed bug; 1:1 provazani pri zmene prenastavilo zmenenou hodnotu
MetaData: max deep pro nesting level optimalizaci snizen
ArrayCollection: fixed bug orderBy; pro php bug #50688 (closes #58)

PHP Warning: usort(): Array was modified by the user comparison function

	usort($array, function ($a, $b) {
		try { throw new \Exception; } catch (\Exception $e) {}
		return strcmp($a, $b);
	});