Refs #399 - Show background logs in the webdriver console

Provides a mechanism for sending console logs from the background service worker and the mocha tests themselves to the webdriver CLI logs. This is great because it means that console logs from those places will actually appear in the CI logs. For example, see CI logs.

The "lint" CI step had to be moved to its own job, so that tests will still run even if the linting it failing because there are logs in the production code.