Add hover support to menu in desktop mode

[valadas]

Add hover support to menu in desktop mode

[jeremy-farrance]

Recommended reading from a friend. :)
https://css-tricks.com/in-praise-of-the-unambiguous-click-menu/

[valadas]

I agree with most of that, but to support a wide use case, I want the base template to support having the parent page be a real page and not only contain it's sub-pages as well as many clients expecting hover behavior. It will be implemented in a fashion that is complementary and does not hinder mobile and keyboard support. I logged it here as I just released v1.0.0 (which had a goal of being totally bootstrap independent making it officially optional). I need to work some more on details of that menu though like hover and aria-attributes and even better keyboard support.