Use unique ports with parallel_tests
Use unique ports with parallel_tests

Every new thread will now start Rails on a different port to avoid port
collisions.

DylanLacey/sauce_ruby,DylanLacey/sauce_ruby,angelabier1/sauce_ruby,bootstraponline/sauce_ruby,angelabier1/sauce_ruby,anthonywoo/sauce_ruby,anthonywoo/sauce_ruby,saucelabs/sauce_ruby,bootstraponline/sauce_ruby,bootstraponline/sauce_ruby,saucelabs/sauce_ruby,angelabier1/sauce_ruby,bootstraponline/sauce_ruby,angelabier1/sauce_ruby