Update to latest workshopper

This is a work in progress. I'm currently having difficulty passing the all your base exercise arguments probably because I haven't fully grasped the workshopper(-excercise) module API.



```bash
levelmeup run solutions/solution.js
ALL YOUR undefined ARE BELONG TO undefined.
```

Any guidance is appreciated. :)
This init doesn't appear in the learnyounode module, which I've been using as a reference. Not sure if it is needed here.