Replaces markdown.js with [remarkable](https://github.com/jonschlinkert/remarkable).

- remarkable has 100% support for [commonmark](http://jgm.github.io/CommonMark/spec.html)
  - [faster](https://github.com/jonschlinkert/remarkable/tree/master/benchmark)
  - easier to monkeypatch. this is a goal of ours, might be useful to you at some point given the custom tokenizing/parsing you're doing for documentation.

grunt/bs-lessdoc-parser.js

@@ -6,11 +6,13 @@
  */
 'use strict';
 
-var markdown = require('markdown').markdown;
+var Remarkable = require('remarkable');
 
 function markdown2html(markdownString) {
+  var md = new Remarkable();
+
   // the slice removes the <p>...</p> wrapper output by Markdown processor
-  return markdown.toHTML(markdownString.trim()).slice(3, -4);
+  return md.render(markdownString.trim()).slice(3, -5);
 }