(docs) add markdown parser to fix docs (RobotWebTools#541)

But option object should be documented according to https://stackoverflow.com/a/14820610/12135039

Author: MatthijsBurgh

Gruntfile.js

@@ -95,11 +95,12 @@ module.exports = function(grunt) {
     jsdoc: {
       doc: {
         src: [
+          './src/*.js',
           './src/**/*.js'
         ],
         options: {
           destination: './doc',
-          private: false
+          configure: 'jsdoc_conf.json'
         }
       }
     }

jsdoc_conf.json

@@ -0,0 +1,6 @@
+{
+  "plugins": [ "plugins/markdown" ],
+  "markdown": {
+    "parser": "gfm"
+  }
+}