Issue #46: Added email support
Issue #46: Added SMS support (Clickatell)
Issue #46: Indentation
Issue #46: Percentage handling for failure rate.
Get transactions for last hour for failure rate.
Refactoring
Issue #46: Don't send alerts more than once per hour when using
failureRate.
Refactoring.
Improved the Alerts model.
Issue #46: Added 'maxAlerts' option
Issue #46: Fetch all missed transactions for a user who has maxAlerts.
Issue #46: Changed the alert message text