Restart the DRB service when it completes it’s thread

Unless it’s explicitly stopped by the user
Add travis file matching adhearsion's supported rubies
Remove Thread.abort_on_exception from Service
Merge pull request #7 from adhearsion/feature/heal_drb_with_thread_join

Restart the DRB service when it completes it’s thread
Version bump
Merge branch 'release/1.1.0' into develop