Oscar Arevalo

* Added two new rule types: "Discard" and "HeartbeatMonitor". Discard is used to tell buglog to discard and not process bug reports that match a given criteria. HeartbeatMonitor can be configured to send an email alert if a message matching a given criteria has not been received in the last X minutes. * Added two more lifecycle execution points for rules: "processQueueStart" and "processQueueEnd"; these methods execute before the queue processing begins and when it ends respectively and regardless of if there are items on the queue or not. * Rule processor now also reports errors to the current buglog instance instead of only writing to a log file.