Convert array to data-attributes

Found it [here](https://github.com/Zaitsev/MtHamlPHP#advanced-data-attribute)

I could imagine it like this:

``` jade
div&data(['some-key' => 'some value', 'int' => 14])
```

resulting in

``` html
<div data-some-key="some value" data-int="14"></div>
```
