As you surely know by now, Jon Stewart is retiring as the host of “The Daily Show,” and just as surely as you know that, you are heartbroken as well. He’s become such a fixture in the world of comedic news, and it’s hard to imagine the show going on without him. But it is going on, natch, and we’ve just learned that Trevor Noah will be Jon’s replacement. Trevor is a relatively unknown comedian, which is fine, but what’s not so fine is that he’s apparently made a whole mess of offensive jokes on Twitter over the years.