refs #2. Implemented a way to notify if a check fails. 'alert_email' can be specify globally or on a per check basis.
revesed the logic on the option used on the run_checks management command (from --alert to --no-alert).
Updated the configuration file to demonstrate how to use this new
feature. Tweaked the datamodel to support a list of alert emails. Added
some test to exercise this new feature.
Adding our secrets.py.asc to ease deployments
Merge pull request #9 from lincolnloop/features/send_alert

Send alert