+ simplified ecv control to use 'url' only, event based mechanism withdrawed
+ refactorings to rename 'liveConnections' to 'aliveConnections'
+ added 'app.close()' to the worker#whenStop, for safety
+ refactorings
+ shutdown now has complete check and guard
+ support cluster start/shutdown arguments from command line!
+ updated demo to showcase
Merge pull request #29 from inexplicable/cluster3

Cluster3