Feature request - default webpage & disable IPv6 or IPv4

[takenek]

Hello,
This is possible to add option to completly disable IPv4 or IPv6 ?
My friend use Your LG in environment where dont have IPv6 - but still IPv6 option is enable, I use in my environment only IPv6 ( lab ) and dont have IPv4 - maybe please add option for select IPv4/IPv6 enable and what is default webpage?
Now default page is: return redirect("/summary/%s/ipv4" % "+".join(app.config["PROXY"].keys()))
so i get error everytime enter to webpage that`s why i change to:
return redirect("/summary/%s/ipv6" % "+".join(app.config["PROXY"].keys()))

Will be cool if You add option like this.
Thanks for Your work!

[zorun]

This sounds possible. Code proposals are welcome, it could be done with new configuration variables (e.g. ENABLE_IPV4 and ENABLE_IPV6 that both default to True)

[zorun]

See #85 : it might be a good opportunity to add new options.