…oyasencha -- manual merge)
…nd for pool size. cleaned up code to pass jshint.
This keeps track of the remove idle timer and will clear the timer when destroyAllNow is called, as after all clients are destroyed there is no need to check for idle clients any longer. Without clearing the timer, a program may have called destroyAllNow because it was about to exit, but if the remove idle timer still exists, the event loop will continue running until at most realIntervalMillis.