Update Travis script

        wait $command_pid

        local command_status=$?

        kill -9 $echo_pid

        [ "$command_status" -ne "0" ] && exit $command_status

        echo "COMMAND STATUS: " "$command_status"

        if [ "$command_status" -ne "0" ]; then

            exit $command_status

        fi

        return 0

    }

    # If the build is for a tag, use that as the image tag

    # If not, use the output of git-describe

    export ESGF_VERSION="${TRAVIS_TAG:-"$(git describe --always --tags)"}"

    keep_alive docker-compose build

    echo "BUILD COMPLETE"

    # If this is a pull request, we are done - all we wanted to do is check it builds

    [ "$TRAVIS_PULL_REQUEST" = "false" ] || exit

    if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then

        exit

    fi

    # If it is not a pull request, then push the tag to Docker Hub

    docker login -u "$DOCKER_USERNAME" -p "$DOCKER_PASSWORD"

    keep_alive docker-compose push