Fix #3: Add syntax highlighting

assets/stylesheets/highlight.less

@@ -0,0 +1,90 @@
+/* http://jmblog.github.com/color-themes-for-google-code-highlightjs */
+
+/* Tomorrow Comment */
+.hljs-comment,
+.hljs-title {
+  color: #8e908c;
+}
+
+/* Tomorrow Red */
+.hljs-variable,
+.hljs-attribute,
+.hljs-tag,
+.hljs-regexp,
+.ruby .hljs-constant,
+.xml .hljs-tag .hljs-title,
+.xml .hljs-pi,
+.xml .hljs-doctype,
+.html .hljs-doctype,
+.css .hljs-id,
+.css .hljs-class,
+.css .hljs-pseudo {
+  color: #c82829;
+}
+
+/* Tomorrow Orange */
+.hljs-number,
+.hljs-preprocessor,
+.hljs-pragma,
+.hljs-built_in,
+.hljs-literal,
+.hljs-params,
+.hljs-constant {
+  color: #f5871f;
+}
+
+/* Tomorrow Yellow */
+.ruby .hljs-class .hljs-title,
+.css .hljs-rules .hljs-attribute {
+  color: #eab700;
+}
+
+/* Tomorrow Green */
+.hljs-string,
+.hljs-value,
+.hljs-inheritance,
+.hljs-header,
+.ruby .hljs-symbol,
+.xml .hljs-cdata {
+  color: #718c00;
+}
+
+/* Tomorrow Aqua */
+.css .hljs-hexcolor {
+  color: #3e999f;
+}
+
+/* Tomorrow Blue */
+.hljs-function,
+.python .hljs-decorator,
+.python .hljs-title,
+.ruby .hljs-function .hljs-title,
+.ruby .hljs-title .hljs-keyword,
+.perl .hljs-sub,
+.javascript .hljs-title,
+.coffeescript .hljs-title {
+  color: #4271ae;
+}
+
+/* Tomorrow Purple */
+.hljs-keyword,
+.javascript .hljs-function {
+  color: #8959a8;
+}
+
+.hljs {
+  display: block;
+  background: white;
+  color: #4d4d4c;
+  padding: 0.5em;
+}
+
+.coffeescript .javascript,
+.javascript .xml,
+.tex .hljs-formula,
+.xml .javascript,
+.xml .vbscript,
+.xml .css,
+.xml .hljs-cdata {
+  opacity: 0.5;
+}

assets/stylesheets/main.less

@@ -5,6 +5,8 @@
 @import "variables.less";
 @import "fonts.less";
 
+@import "highlight.less";
+
 @import "book/header.less";
 @import "book/summary.less";
 @import "book/body.less";

lib/parse/page.js

@@ -3,6 +3,13 @@ var marked = require('marked');
 
 var renderer = require('./renderer');
 
+// Synchronous highlighting with highlight.js
+marked.setOptions({
+    highlight: function (code) {
+        return require('highlight.js').highlightAuto(code).value;
+    }
+});
+
 
 // Split a page up into sections (lesson, exercises, ...)
 function splitSections(nodes) {