Updated config.rb
Updated config.rb

It now allows configuring parent-tunnel through Sauce::Config
saucelabs/sauce_ruby,bootstraponline/sauce_ruby,saucelabs/sauce_ruby,bootstraponline/sauce_ruby,bootstraponline/sauce_ruby,DylanLacey/sauce_ruby,angelabier1/sauce_ruby,angelabier1/sauce_ruby,anthonywoo/sauce_ruby,angelabier1/sauce_ruby,DylanLacey/sauce_ruby,angelabier1/sauce_ruby,bootstraponline/sauce_ruby,anthonywoo/sauce_ruby