Updating Travis CI to run tests on HHVM
Updating Travis CI to run tests on HHVM

rafwlaz/rhumsaa-uuid,michabbb-backup/uuid,ihsanudin/uuid,michabbb-backup/uuid,yiliaofan/uuid,rmblstrp/uuid,cureoeu/rhumsaa-uuid,00F100/uuid,aztech-forks/uuid,ramsey/uuid,ramsey/rhumsaa-uuid