title: Swift Tutorial "GuidedTour.playground" does nothing when opened in XCode6
body: <p><a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GuidedTour.html#//apple_ref/doc/uid/TP40014097-CH2" rel="nofollow noreferrer">This apple developer page introducing Swift</a> has a link 3 paragraphs down for downloading the "GuidedTour.playground" file, which is supposed to allow you to follow along interactively with the tutorial.  However, when I open this file in XCode6 Beta (I'm on a 2 month old MB pro, OSX 10.9.3), I see only this screen, which does not respond to mouse clicks or anything else (NOTE: "GuidedTour.playground" is the foreground window, there is another default playground window behind it):</p>
  
  <p><img src="https://i.stack.imgur.com/FIh74.png" alt="Inert GuidedTour Window"></p>
  
  <p>How can I make it work?</p>
  
  <p>Bonus Question: Probably unrelated, but when I play with the default playground I can't figure out where <code>println</code> statements are supposed to output to. They don't appear in the realtime righthand pane, or in the console at the bottom.</p>