OutriggerImpl starts thread in constructor

[Peter Firmstone]

I'd like to add a start() method to OutriggerImpl, so I can delay any 
threads from being started until after construction is complete.

This is required for safe publication to comply with the JMM.
Before doing so, I'd like to know how people are using Outrigger, so I 
can minimise unintended consequences / breakages.

Comments, opinions and thoughts?

Regards,

Peter.