Move FEP Negotiation for Fields into a Directive

[maxdumas]

After considering a better way to approach this, I realize that we can really simplify our templating logic by bundling it into a directive or two. We wouldn't have to pollute the entire scope with an instance of the FEP then, and we could really centralize how some stuff is calculated. For example we have three places where almost identical LIST logic is repeated: for the LIST action, the link-multiple typeahead, and the link-single typeahead. With smart use of directives I think we could boil this down to 1.