Support for Nette\Utils\Html object as select input items

[aleswita]

Sometimes i need set the items of select input like array below, so this pull request fix the problems with this solution.

$items[] = Utils\Html::el("option")->value(1)->setText("Value 1")->disabled(FALSE)->setTitle("Help text");
$items[] = Utils\Html::el("option")->value(2)->setText("Value 2")->disabled(FALSE)->setTitle("Help text");
$items[] = Utils\Html::el("option")->value(3)->setText("Value 3")->disabled(TRUE)->setTitle("Help text");

[duskohu]

Thx :thumbsup: