Merge branch 'jbpasquier/slugs' into 'master'

update: migrate user meta to djangoldp-account

See merge request !101

djangoldp/models.py

 from django.conf import settings
-from django.contrib.auth.models import User
 from django.db import models
 from django.db.models.base import ModelBase
 from django.db.models.signals import pre_save, post_save
@@ -11,9 +10,6 @@ from django.utils.decorators import classonlymethod
 from djangoldp.fields import LDPUrlField
 from djangoldp.permissions import LDPPermissions
 
-User._meta.rdf_type = "foaf:user"
-User._meta.owner_field = "id"
-
 
 class Model(models.Model):
     urlid = LDPUrlField(blank=True, null=True, unique=True)