- Updates all mailing methods to return true on success and error message on failure
- Replaces WPMail with Swift using local transport (PHP mail) - Fixes AmazonSES region naming convention - Updates tests
- Refactors SendingQueue worker class - Adds Maier router with a send() method + ability to specify sending method - Updates tests - Introduces 'stopping' and 'starting' cron states - Improves cron control mechanism Closes #276