Introduce onChildExit-hook
Bugfix: Zombie process occures in daemon-example
Bugfix: Minimum running workers are not created
Bugfix: WorkerProcess has no semaphore
Introduce public method to get all results
Add method to attach to process signals in general
Adjust test

See #36f933e62e7f866a0fba5f49fce021b5814ea145
Bugfix: Semaphore is not set in worker process
Bugfix: Destroy method is not called
CGL issue
Use test-prefix in test methods
Adjust examples