Add "position" option (#4)
Add "position" option (#4)

* Add "position" option

Sometimes, it is not desirable to always inject the `<style>` tag at the end of `<head>`, since you might want to override some of the styles in CSS.

This adds a third parameter for custom options, where you can specify:
```javascript
{
  position: "top",
}
```

* Remove "this"

egoist/style-inject