title: Center Align in interface builder in both iPhone 5 and iPhone 4
body: <p>In XCode interface builder : I have some images in my view that I need them to be center aligned vertically.
  But screen height of Retina 4 and Retina 3.5 differs and I don't like to use OS6 for relative coordinates.
  Is there anyway to do this is interface builder or I should write some code?</p>