Only run Saucelabs test with secure variables

This is intended to short circut PRs so that they don't get marked as
failed when they don't have access to the Sauce vars.

script/ci

@@ -6,7 +6,7 @@ elif [ "$TEST_SUITE" == "phantomjs" ]; then
   bundle exec rackup -s puma -p 5000 -D
   sleep 3
   ./run_jasmine.coffee http://localhost:5000/spec.html
-elif [ "$TEST_SUITE" == "saucelabs" ]; then
+elif [ "$TRAVIS_SECURE_ENV_VARS" == "true" && "$TEST_SUITE" == "saucelabs" ]; then
   bundle exec rackup -s puma -p 5000 -D
   sleep 3
   curl https://gist.github.com/santiycr/5139565/raw/sauce_connect_setup.sh | bash