all the `keydown` block it's a botched attempt at being smart when using a keyboard...

On second thought, I'd go for an extremely light first version:

```javascript
[...]
keydown: function (e) {
      $(this).toggle
}
[...]
```

This should be enough to provide the basic functionality, while proceeding further - maybe next version? - I'd like to have the following behaviour:

- on active via keyboard, give focus to the sidebar
- while in sidebar: ESC gives back focus to the toggler anchor/button

I don't feel skilled enough now, but I'm willing to improve myself and this plugin.

Your thoughts on my plan?