small update in models : idUser and idArtcle are not required anymore to allow anyone to connect and add a new empty book
from django.conf.urls import patterns, url
from rest_framework.authtoken import views
from authentication.views import User, ObtainAuthToken
urlpatterns = patterns('',
url(r'^user', User.as_view()),
url(r'^api-token-auth', ObtainAuthToken.as_view())
)