expected

Hi there! How you doing? Hope you are fine!

I tried making a simple app like this

```
var extractCss = require('extract-css');
var options = {
url: './',
applyStyleTags: true,
removeStyleTags: true,
applyLinkTags: true,
removeLinkTags: true,
preserveMediaQueries: false
};

var document = `

`
extractCss(document, options, function (err, html, css) {
//console.log(html);
console.log(css);
});
```

And there is no output..


I read the [README.md](https://github.com/jonkemp/inline-css/blob/b7a249cf1482908de947738673c0997151f3b090/README.md) and see some HTML in the [expected folder](https://github.com/jonkemp/inline-css/blob/master/test/expected/)... but got no more clues about how to make this work,.

Would you be so kind of providing some working examples?

Greetings

Thanks.