Add support for an extended validation certificate

[april]

Here's the first go at it. It's a bit awkward, so feel free to let me know what you truly think. :)

[lgarron]

LGTM. You sure you want extended-validation instead of ev?
(I'd be fine with adding a redirect from the latter to the former.)

[april]

I prefer to be verbose when possible, but I think adding a redirect seems like a fine idea. Lemme do that real quick.

[april]

I initially added ev.__DOMAIN__ to the cert, but then I realized that it would complicate the process of acquiring the production EV cert.

As such, I decided to use the normal wildcard cert for the redirect. Also if you think http://ev.badssl.com/ should redirect immediately to https://extended-validation.badssl.com/, I can make that tweak.

[lgarron]

Still looks good to me!

As such, I decided to use the normal wildcard cert for the redirect. Also if you think http://ev.badssl.com/ should redirect immediately to https://extended-validation.badssl.com/, I can make that tweak.

I would slightly prefer http://ev.badssl.com/-> https://ev.badssl.com/ -> https://extended-validation.badssl.com/ but it doesn't sound super important.

[april]

Made the slight tweak to reflect @lgarron's most recent feedback. Thanks, @lgarron!