title: Custom UITabbarItem without title created with storyboard
body: <p>I know this is probably something very basic but I can't, for the life of me, figure out how to do it. I've searched around but haven't seen any solution that works.</p>
  
  <p>I have set up a UITabbar using Storyboard and I have it set up to use custom images (the tab bar items are set up as "Custom" in the storyboard). I am not setting any title for the tab bar items.</p>
  
  <p>The image appears raised and there is still the space reserved for the title. The image is 30x30 (and 60x60 for retina, named info.png and info@2x.png respectively).</p>
  
  <p>Things I have tried</p>
  
  <pre><code>[[UITabBarItem appearance] setTitlePositionAdjustment:UIOffsetMake(0.0, -50.0)]; 
  // to make the title go off the tabbar. Have also tried other offsets less and greater than -50.
  </code></pre>
  
  <p>That does move the title but the image stays in the same place. Next I tried</p>
  
  <pre><code>UITabBarItem * tabItem5 = [self.tabBar.items objectAtIndex: 4];
  [tabItem5 setTitle:nil];
  </code></pre>
  
  <p>Neither of those solutions worked. I don't want to programmatically declare the UITabbar. There has to be a way of doing this for UITabbars declared using storyboard / IB.</p>
  
  <p>Help will be appreciated,
  Thanks!</p>