Add Slide Mode

using reveal.js
and some part of reveal-md

public/lib/js/html5shiv.js

@@ -0,0 +1,7 @@
+document.createElement('header');
+document.createElement('nav');
+document.createElement('section');
+document.createElement('article');
+document.createElement('aside');
+document.createElement('footer');
+document.createElement('hgroup');