title: Remove UITabBar horizontal separator in iOS7
body: <p>I want to remove the horizontal separator line between a UITabBar and the rest of the screen. I'm asking <a href="https://stackoverflow.com/q/11104796/1224741">the same question as this guy</a> but updated for iOS7. </p>
  
  <p>Setting the background image of my UITabBar doesn't alleviate the problem, nor does setting the background image of the <code>[UITabBar appearance]</code> object.</p>
  
  <p>Is this still possible in iOS7? If so, how?</p>