Integration tests on Travis are broken

[minusnine]

1.52s$ ./testing/travis-ci-test.sh
=== RUN TestFirefoxSelenium3
--- SKIP: TestFirefoxSelenium3 (0.00s)
remote_test.go:166: Skipping Firefox tests using Selenium 3 because Selenium WebDriver JAR not found at path "vendor/selenium-server-standalone-3.4.jar"

[minusnine]

Fixed now.