Topics/cli wrapper

@fh 

Check it out — I am not completely done yet, but it should do:

```
rake install
rbenv rehash
bib-vagrant
```

It shows configuration and creates it. So that's helpful, and something we can point people to. Any idea what else I should add? I was thinking "validate", to make sure bools and paths are correct, and also the "additional json".

LMK what you think!