feature request: download to self named folder

Could you add flag to the API that is effectively this one line equivalent? I end up doing this each time.
`cd X; mkdir X; download X`

- For example X="google-analytics-customer-revenue-prediction"
-
- `mkdir google-analytics-customer-revenue-prediction;cd google-analytics-customer-revenue-prediction; kaggle competitions download -c google-analytics-customer-revenue-prediction`
-
- Possible flags: -s --self-named-path
-
- Fails if that path X already exists of the files exits. Needs a "force" flag to overwrite.

Note current flags for reference:
```
usage: kaggle competitions download [-h] [-f FILE_NAME] [-p PATH] [-w] [-o]
[-q]
[competition]
```

Also, -w (current working path seems to be default) ... is this needed?