Figure out how to extend Lifecycle to add a health check

[oubiwann]

There are probably several ways to do this, but I settled on the approach of using extend directly, and thus declaring behaviours (method maps) explicitly. I've got a prototype in place for DockerRunner, but this will require updating other services to split things out, too (i.e., no in-line protocol/record implementations).

[oubiwann]

Figured out in:

• 7595d13
• 2dde3e1
• 9279b00
• be895a4
• baa3523

[oubiwann]

Updated other services to use the new lifecycle approach here:

• ProcessRunner - d42a542
• Remaining D.E.M. components - 39690bf