Make more SMS request info available

Provides the capability to query whether an SMS token request was ignored:

```python
>>> sms = authy_api.users.request_sms('authy-id')
>>> sms.ok()
True
>>> sms.ignored()
True
```

We need this in order to be able to display different content to users depending on whether they should expect an SMS or not.

Also a few tests were broken, which I fixed in the first commit.