Revert "Allow proxies to be specified with environment variables."
Revert "Allow proxies to be specified with environment variables."

This reverts commit 86735548a5bd8cb804ecb9938555d0e27a205a68.

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