Updated docstring.
Readline utilized!!
Killed producer when consumer is no longer listening.
Basic ^Z handling set up.
Added signal-catching demo file.
Created de-zombify demo file.
Un-did all the job-related code.
Created JobList class.
"Broken" build. Process state related foundations ready, but job list is
broken, due to method lookup and deepcopying etc.
Done jobs done!
Built the jobs builtin.