Feature request - setup proxy support

[digininja]

I quite often end up trying to install the Python EW on boxes which don't have full internet access and the only way to get installers to work is to run them through a forwarded proxy.

For Kali, this means setting the http_proxy and https_proxy environment variables, adding an entry to the apt conf.d directory, and setting up Git.

It would be cool if the setup.sh script could take a parameter and set all these while it is running so I don't have to mess setting them up on each box.

If you want to do it, tell me, I've got it pretty well documented.

[ChrisTruncer]

If you have it documented or coded, that would certainly help. I don't currently have an environment where I can test that setup, so I'd largely have to rely on the code that you submit. But I'm happy to get it merged in.