Add command to tail the logs from the remote cli

[lutzmor]

A common non-dev use case for the remote cli would be to tail the logs. To achieve this the Logger should have an event emitter that can be subscribed to by a remote cli command.

Tasks:

• Extend Logger interface to expose an event emitter (broadcast on Logger.log)
• Ensure all spies that spyOn persistLog have not been broken
• Add CLI command to subscribe to the log stream