~ 0.4.14
+ reversed the order of suicide, worker cannot commit till master grants it the right
+ refactored the graceful shutdown to let SIGINT, SIGTERM use the same logic
+ replaced Q lib dep with when lib, lighter, faster and no 'done' required at the end of the chain
+ fixed bug of exit 0 handling at master side, stats and worker list must be updated
- disable component-status-test it's a mocha test