Proxies support for SauceClient for Python

[simi823]

Recently Sauce Labs and I figured that the sauceclient for python does not seem to support proxies out of the box. I am trying to run my test scripts using Behave and Python from a web server. The test start on Sauce however they do not complete properly, preventing the sauce jobs update to send pass/fail information or custom data to Sauce for the job. The tests display as Complete, but not identified as passed or failed.