settings: Set STAGING to False in DEFAULT_SETTINGS.

This makes it possible to use this for features like managing the
soft-deactivation cron job running in only one place.

zproject/settings.py

@@ -118,6 +118,7 @@ DEFAULT_SETTINGS = {'TWITTER_CONSUMER_KEY': '',
                     'EMAIL_HOST': None,
                     'EMAIL_BACKEND': None,
                     'NOREPLY_EMAIL_ADDRESS': "noreply@" + EXTERNAL_HOST.split(":")[0],
+                    'STAGING': False,
                     'S3_KEY': '',
                     'S3_SECRET_KEY': '',
                     'S3_AVATAR_BUCKET': '',