Used https://github.com/paypal/dce-go/blob/develop/examples/client.go#L50
to create a json file for a job that uses the docker-compose executor.
The current job json file (examples/job.json) uses an outdated version
of docker-compose executor. Once examples/client.go has been modified
to use examples/job_dce.json, it should be okay to get rid of
examples/job.json.
