Better naming
Minor DRY-ification
Add tests for RemoteViaSocket shut-downs, restarts, etc.

and fix some issues
Add World#execute_planned_execution_plans

It triggers execution of planned ExecutionPlans which were planned before
World started. SimpleWorld does it automatically, it should be called on
World manually.
Clean up test output
Add ruby 2.1
Merge pull request #91 from pitr-ch/master

Add tests for RemoteViaSocket shut-downs, restarts, etc.