Adding icons to Navigation menu

Just downloaded Vantage and its great. I see that you use font awesome icons and the Home page menu links can have a Home icon. How can I add different icons to my other navigation links/items?

For example: I added icon-globe to the CSS classes box in the Menu Structure page. The icon shows but does not align with the menu item.

Your documentation page shows a Sample page with a briefcase icon. How would I go about adding them?