Show modules in navigation list

As pointed in #25 modules are not shown in navigation panel on the left, so basically it is currently not possible to browse through documentation of a module with some loose functions inside. This PR makes such docs visible in the panel:

```js
/** @module Helpers */

/** 
 * This is only a sample function.
 * @method
 * @return {String}
 */
function getSomething() {
    return "sth";
}
```