Unflatten data received from backend.

[mimo00]

Hi!
Firstly, thank you for package it is very helpful for us :)
The bug:
I am taking data from social login:
data = backend.user_data(response.get('access_token'))
Data from facebook backend looks:
{/data/}
And from Instagram:
{'data': {/data/}}
So data from Instagram are wrapped by 'data' key