Added proper exiting in shovel for forking children, added test script to override process.exit in testing environment
Added proper exiting in shovel for forking children, added test script to override process.exit in testing environment

DonaldKellett/codewars-runner-cli,DonaldKellett/codewars-runner-cli,lteacher/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,Codewars/codewars-runner,Codewars/codewars-runner-cli,lteacher/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,lteacher/codewars-runner-cli,lteacher/codewars-runner-cli,DonaldKellett/codewars-runner-cli,OverZealous/codewars-runner-cli,OverZealous/codewars-runner-cli,DonaldKellett/codewars-runner-cli,lteacher/codewars-runner-cli,OverZealous/codewars-runner-cli,DonaldKellett/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,DonaldKellett/codewars-runner-cli,OverZealous/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,Codewars/codewars-runner-cli,DonaldKellett/codewars-runner-cli,Codewars/codewars-runner,Codewars/codewars-runner-cli,DonaldKellett/codewars-runner-cli,lteacher/codewars-runner-cli,DonaldKellett/codewars-runner-cli,Codewars/codewars-runner-cli,OverZealous/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner,Codewars/codewars-runner-cli,Codewars/codewars-runner,Codewars/codewars-runner,OverZealous/codewars-runner-cli,lteacher/codewars-runner-cli,lteacher/codewars-runner-cli,DonaldKellett/codewars-runner-cli,DonaldKellett/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,Codewars/codewars-runner-cli,lteacher/codewars-runner-cli,OverZealous/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,Codewars/codewars-runner-cli,Codewars/codewars-runner-cli,lteacher/codewars-runner-cli,lteacher/codewars-runner-cli