Run tests against vagrant

The only thing currently failing is foodcritic with:
```
FC023: Prefer conditional attributes: ./recipes/default.rb:28
```
 - not sure if you want to fix this or ignore it, so I'll leave it there for now...
 - already fixed `FC045: Consider setting cookbook name in metadata: ./metadata.rb:1`
 - not sure if it's possible / you want to run vagrant tests on travis, so I left foodcritic in there
 - the chefignore is a bit big, feels free to kill what you don't want, it's our default set :)