setClass(element, add, remove, [options]);
Performs both the addition and removal of a CSS classes on an element and (during the process) triggers an animation surrounding the class addition/removal. Much like $animate.addClass and $animate.removeClass, setClass will only evaluate the classes being added/removed once a digest has passed. Note that class-based animations are treated differently compared to structural animations (like enter, move and leave) since the CSS classes may be added/rem