Silence Django warnings by adding a test runner.

settings-sample.py

@@ -120,6 +120,9 @@ INSTALLED_APPS = (
     'django.contrib.admin',
 )
 
+# Defines a test runner
+TEST_RUNNER = 'django.test.runner.DiscoverRunner'
+
 # A sample logging configuration. The only tangible logging
 # performed by this configuration is to send an email to
 # the site admins on every HTTP 500 error.