set list items to behave like fragments

[tyarkoni]

@effigies: if you want list items to behave like fragments, add the following to your ~/.jupyter/custom/custom.js file (and make sure you have RISE installed):

require(['base/js/events'], function(events) {
    events.on("rendered.MarkdownCell", function() {
        $('li').addClass('fragment');
    });
});