Using nested objects in JSON
I tried to use a nested object like: 

```
[
 {
    name: "Test"
    nested : {
     image : "images/image.jpg"
  }
 }
]
```

Actually I think the data populator does not support nested objects. 
It would be great to add that feature in a future realse. Referencing could work like: {nestes.image}

Thank you for the great work !
Alex
