Fixing django-sample (#413)

* [django-sample] Fixing bugs and removing useless imports

* [django-sample] Adding requirements

* [django-sample] Adding make file

* Adding test to Makefile
diff --git a/samples/django_sample/settings.py b/samples/django_sample/settings.py
index ceb4b29..76a16a8 100644
--- a/samples/django_sample/settings.py
+++ b/samples/django_sample/settings.py
@@ -79,5 +79,7 @@
     'django.contrib.contenttypes',
     'django.contrib.sessions',
     'django.contrib.sites',
-    'django_sample.plus'
+    'plus'
 )
+
+GOOGLE_OAUTH2_CLIENT_SECRETS_JSON = 'client_secrets.json'