Make username and API key optional
Make username and API key optional

You do this if you are already configured or are using heroku

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