Hybrid Attackers - Melee and Ranged

I've heard of a few examples of units that have both a ranged attack and a melee attack, but all the examples are of units in Brave New World (or Brave-New-World-only mods). Does that mean this is a feature that is only available for Brave New World? Is there a way to do this in Gods & Kings?

I think you can make such units in any version of Civ5, by not giving PROMOTION_ONLY_DEFENSIVE to a ranged unit. It will perform a ranged attack by default, but you can select melee attack by using the attack button or Ctrl-A key. I'm not sure how the AI will use them, probably it depends on the AI types you give to the unit.