Add sliding 24 hours period

[adriaandotcom]

Shows last 24 hours instead of today which starts at 0:00

Now one thing that bums me out about basically every analytics service is that there's no sliding 24h window and I just don't get it. When I get up at 5am, the "Today" view is absolutely useless. But since all do that, I guess it's me, not you.

Let's add this!