Updated CLI to optionally provide the full-JSON representation of a card

commit message:
```
added "fullcard" and "fullid" CLI targets to support the REST server use-case of getting the full JSON representation of a card using a backend server process; added an "id" CLI target to match with the existing "card" target; updated README accordingly
```

I've been using the much older REST-server version of tutor in my project (https://github.com/rdennis463/cuesbey) to insert a card into the backend-server using the full JSON representation.

The current CLI only supports a "summary" type of view, which wouldn't be as helpful in my use-case.

The intention behind this commit is to add more of the original REST-server functionality to the CLI executable.

Really love the work on tutor, and happy to keep contributing despite not having a lot of coffeescript experience ahead of time.