add classes to integrate html with new bit-docs-prettify, with prism

Author: Christopher Baker

demo_frame.stache

@@ -8,7 +8,7 @@
 		<iframe src="{{demoSrc}}"/>
 	</div>
 	<div class="tab-content" data-for="html">
-		<pre class="prettyprint"></pre>
+		<pre class="line-numbers language-html"></pre>
 	</div>
 	<div class="tab-content" data-for="js">
 		<pre class="line-numbers language-js"></pre>

demo_tpl.js

@@ -8,7 +8,7 @@ module.exports = `
 		<iframe></iframe>
 	</div>
 	<div class="tab-content" data-for="html">
-		<pre class="prettyprint"></pre>
+		<pre class="line-numbers language-html"></pre>
 	</div>
 	<div class="tab-content" data-for="js">
 		<pre class="line-numbers language-js"></pre>