Update cookbook to work with runit >=1.0.0

The new runit cookbook doesn't provide a run_restart attribute since it
no longer restarts on runit template changes.

runit_service is now also a proper provider instead of a definition that
creates a service resource. Thus `notifies` now needs to notify
runit_service instead of service.
Merge pull request #6 from racker/update_for_new_runit

Update cookbook to work with runit >=1.0.0