Delay accessing the User model to prevent AppRegistryNotReady
Delay accessing the User model to prevent AppRegistryNotReady

Closes #1319

pztrick/django-allauth,lukeburden/django-allauth,rsalmaso/django-allauth,nimbis/django-allauth,AltSchool/django-allauth,rsalmaso/django-allauth,AltSchool/django-allauth,lukeburden/django-allauth,jwhitlock/django-allauth,joshowen/django-allauth,wli/django-allauth,spool/django-allauth,spool/django-allauth,lukeburden/django-allauth,pennersr/django-allauth,nimbis/django-allauth,pennersr/django-allauth,pztrick/django-allauth,pztrick/django-allauth,jwhitlock/django-allauth,spool/django-allauth,bittner/django-allauth,joshowen/django-allauth,jwhitlock/django-allauth,bittner/django-allauth,bittner/django-allauth,wli/django-allauth,pennersr/django-allauth,wli/django-allauth,joshowen/django-allauth,rsalmaso/django-allauth,nimbis/django-allauth,AltSchool/django-allauth