As a GH user I can associate a Story with an Epic without having to have remembered the issuekey of the Epic, to avoid mistakes and make Epic linking easier

The epic system is new and most welcome, but like most new features there are many things that could be done to improve it; one is not having to remember the epic's key when link a story to an epic. There are multiple ways of achieving this including; (pop up list, auto-complete ala linking, drag and drop)