Add data migration for adding the google socialaccount

The data migration adds the configuration for the Google
socialaccount to the database if the required settings are set.

Issue: HIC-289
Change-Id: I9e849f1c73a26ca4f5475844c3eeddd2196f0d45
diff --git a/hiccup/settings.py b/hiccup/settings.py
index f5703c7..8a06b15 100644
--- a/hiccup/settings.py
+++ b/hiccup/settings.py
@@ -178,6 +178,11 @@
     }
 }
 
+# To use the Google OAuth feature, overwrite these values with the correct
+# client id and secret in your local settings before running the migrations.
+SOCIALACCOUNT_GOOGLE_CLIENT_ID = ""
+SOCIALACCOUNT_GOOGLE_SECRET = ""
+
 # Static files (CSS, JavaScript, Images)
 # https://docs.djangoproject.com/en/1.9/howto/static-files/