Feature/633 new name for json object rendering

### Description
New name for JSON object rendering.
The old name 'attributesFormat' is not good.
New name: 'attributeFormat'.
Old name is still supported.

If this .test is supposed to cover the obsolete token, should't it be?

```
--urlParams attributesFormat=object
```

(with 's')

Should be fixed in all the ocurrences of this in the .test (there are more below).