Updates

This feature allows sub-tree directory parsing of `markdown` docs from `/docs` directory.

In few, now you can manage documents as:

```
/docs
|-- index.md
|-- format.md
|-- api
   |-- get.md
   |-- post.md
   |-- delete.md
...
```

Also add some docs on `node-markdocs` internal API with comment blocks.
New issue! :dancer: 

I didn't changed any regex nor sensitive features since there are not one single test on this.

I'd like to know what this regex is supposed to match, make a test, and then change it properly.

I know what you say is true, but I tend to believe that things are done for a reason... and I'd like know that reason before... (or at least do some testing)