Daniël Ducro issues

Results 3 issues of


                                            Daniël Ducro

`@change="onUpdate"` Is not called on the scroll-item, only on the container. I ended up not using this feature.

This solves issue #2. You can pass a css query selector as the argument like: `container=".scroller"`

This PR checks if translationModel and localeKey exists to prevent MissingAttributeExceptions.