Feature/add travisci

[jnkrupp]

• Added TravisCI testing and docker-compose to dcc-action-service.
• Added files .travis.yml, Makefile, docker-compose.yml, and two test files (test_action-service.py and test_sample.py) for pytest testing, as well as updated Dockerfile_decider, run_Luigi_Deciders.sh, setup_decider_jobs.sh, and base_decider.py.
• The .travis.yml file runs Makefile, which brings up the containers for dcc-action-service and elasticsearch. After that, populator.sh is run, and finally the pytest tests are run inside the action-service container.