Using multiple saucelabs accounts on travis

travis.sh

echo "Connecting to Saucelabs..."
case "$((${TRAVIS_BUILD_NUMBER:(-1):1}/2))" in
"1")
    TRAVIS_SAUCE_CREDENTIALS="sauce-subaccount1,access-key"
    echo "Using sauce-subaccount1"
    ;;
"2")
    TRAVIS_SAUCE_CREDENTIALS="sauce-subaccount2,access-key"
    echo "Using sauce-subaccount2"
    ;;
"3")
    TRAVIS_SAUCE_CREDENTIALS="sauce-subaccount3,access-key"
    echo "Using sauce-subaccount3"
    ;;
"4")
    TRAVIS_SAUCE_CREDENTIALS="sauce-subaccount4,access-key"
    echo "Using sauce-subaccount4"
    ;;
*)
    TRAVIS_SAUCE_CREDENTIALS="sauce-subaccount0,access-key"
    echo "Using sauce-subaccount0"
    ;;
esac
echo $TRAVIS_SAUCE_CREDENTIALS >> .sauce_config