RandomKiller actor implementation

With additional changes discussed in previous pull req
Merge pull request #21 from tomrozb/random-killer-alone

RandomKiller actor implementation
Goodfather sample implementation

Just proof of concept
Doc improvement for the Godfather.
Merge pull request #22 from tomrozb/goodfather-proof-of-concept

Goodfather sample implementation
Integration test for the RandomKiller
Merge pull request #23 from tomrozb/random-killer-integration-test

Integration test for the RandomKiller