+ warmup enhancements
~ warmup for each worker now uses an intermediate server listening to 'warmup port' till warmup function is completed
~ then the worker starts the real server listening to the actual port
~ master awaits 'worker-%pid-listening' event
Merge pull request #55 from inexplicable/cluster3

+ warmup enhancements
Merge pull request #8 from cubejs/cluster3

Cluster3