Added API tests.

The tests start the docker-compose stack and will then start securityTest and assert that the detected findings match the expectations.

Notes

• the tests currently only run against the develop tag. The build uses a build matrix for the docker tag and can be expended for more tags by commenting out this line:

  secureCodeBox/.travis.yml

  Line 7 in 7cc799d

  # - DEFAULT_TAG=latest

• The tests run on branch and pr's to this repo and will also be run once a day (via a travis chron)
• Running docker-compose up will now wait for the engine healthcheck to complete before starting the scanner. This makes waiting for the engine to start up trivial, but unfortunatly also meant that i had to downgrade the docker-compose file version to 2.1, as 3 doesn't support conditionals in depends_on anymore.
• The tests are written in js using jest as the test runner.