title: Add icons in UITabItem for UITabBarViewController with Xcode 5.0
body: <p>I would to use a tabbar based app. </p>
  
  <p>So, I added a UITabbarViewController in my storyboardapp but I can't configure the tab icons.
  When I set the icon in the tabItem I see only a gray shape...</p>
  
  <p>I use xcode 5.0.</p>
  
  <p>Is there a particular way to set icons on the tabbar?</p>
  
  <p><img src="https://i.stack.imgur.com/MqiL1.png" alt="enter image description here">
  <img src="https://i.stack.imgur.com/t4ESD.png" alt="enter image description here"></p>