OpenID support

I’ve added support for OpenID. For those of you from LiveJournal, this means you have an easy way to post comments here. You’ll see an OpenID URL box when you comment. You already have an OpenID – LiveJournal invented it – and it’s simply the URL of your LJ: for example, mine is http://elbeno.livejournal.com. Put this in the OpenID URL box, and if you are logged in to LiveJournal, you’ll get a page asking whether you want to be identified to https://www.elbeno.com/blog. After you OK that, you’re done. Your ID will be known to this blog, and you won’t have to do register a username here, or type in an email address, or any of that nonsense.