Format the given string, usually a headline or title, with either AP or MLA style.
Accepts ap or mla as an argument. Defaults to ap if none is specified.
title: I see a bad-ass mother who don't take no crap off of nobody.{{ title | headline('ap') }}I See a Bad-Ass Mother Who Don't Take No Crap Off of Nobody.{{ title | headline('mla') }}I See a Bad-ass Mother Who Don't Take No Crap Off of Nobody.
