title: Reload a tableView from the AppDelegate
body: <p>I have a pretty simple question, but am still finding my way around cocoa.
  I have a normal rootViewController App as created in Xcode. In the AppDelegate I have a function to update the database. When a Push-message comes in while running (didReceiveRemoteNotification:) the data is updated.</p>
  
  <p>But how do I get a handle on the the RootViewController telling it to update its objects and then reload the table (which is a function)?</p>