Use Travis CI container infrastructure
Use Travis CI container infrastructure

Should be able to benefit from faster build start times along with
faster builds by updating the config to use addon->packages
configuration option for pdftk.

See: http://docs.travis-ci.com/user/migrating-from-legacy/

ministryofjustice/atet,ministryofjustice/atet,ministryofjustice/atet,ministryofjustice/atet