First support for md extensions; Package all needed dependencies in the repo

Source/node_modules/pug-runtime/wrap.js

@@ -0,0 +1,10 @@
+var runtime = require('./');
+
+module.exports = wrap;
+function wrap(template, templateName) {
+  templateName = templateName || 'template';
+  return Function('pug',
+    template + '\n' +
+    'return ' + templateName + ';'
+  )(runtime);
+}