As of django 1.7, admin.autodiscover() is called automatically

...when django.contrib.admin is in INSTALLED_APPS
https://docs.djangoproject.com/en/1.7//ref/contrib/admin/#django.contrib.admin.autodiscover
Merge pull request #35 from ccnmtl/remove-admin-autodiscover

As of django 1.7, admin.autodiscover() is called automatically