For all the iPhone users out there, a heads up: Gothamist has just released its first iPhone app, dubbed “Istaverse.” You can download it free from iTunes here. There’s a couple things about the application that you should know. For one, the “Istaverse” app is really designed for our readers who like to keep tabs on more than one of the -Ist cities at a time. If you only ever want to read DCist, you…