1. Removed Operations folder and moved relevant files under HeartbeatMonitoring

2. Removed Alerts
3. Added EventLog instead.
4. EventLog consists of a generic audit handler that handles IEvents. In order to filter what messages need to be logged in Raven, only messages that contain EventLogDefinitions will be logged.
1. Added a convention to register all messages that start with ServiceControl.Plugin and ends with Messages so that commands from the plugin can be processed automatically

2. Renamed namespaces for the Messages project.
Merge pull request #129 from Particular/alertsCleanup

Alerts cleanup