Run tests against Travis
Run tests against Travis

Now that the Puppet repository is public, we can run our tests on
Travis.

This allows us to run tests against pull requests from forks of the repo
(which we can't do with Jenkins).

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet