remove the admin and auth application

The application should simply record the sensor values and display them in a
pretty graph. There's nothing that would require administration or a login.

sensors/sensors/settings/base.py

@@ -25,8 +25,6 @@ DEBUG = False
 # Application definition
 
 INSTALLED_APPS = [
-    'django.contrib.admin',
-    'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',
     'django.contrib.messages',