When running locally, there's not TRAVIS_JOB_NUMBER env variable defined and it screws
the Sauce Connect (it uses a tunnel with empty name), this makes it work locally without defining
TRAVIS_JOB_NUMBER env variable.
Also, if you run the sauce_connect_setup.sh locally, without having SAUCE_CONNECT_READY_FILE, it
does not pass the `--ready-file` argument to avoid Sauce Connect blowing up.
This should not affect the Jenkins build at all.
Now, the Travis build uses Chrome on Sauce Labs, which in theory gives us opportunity to use any
browser/platform that Sauce Labs offers.
