[RFC] Add authtoken auth using django_rest framework

[claudyus]

Here a one-line patch from @cvalenti that allow the users to query api using auth token.

To generate a token (coder way):

from rest_framework.authtoken.models import Token
from django.contrib.auth import get_user_model
User = get_user_model()
user = User.objects.get(username='admin')
token = Token.objects.create(user=user_admin)
print token.key

to use it:

curl -X GET <url> -H 'Authorization: Token <token_id>' | python -m json.tool

INVESTIGATION NEEDED: @cvalenti, @nemesisdesign How to generate auth token from admin interface?
Q: Where this should be documented?