[Xcode] Display Launch images size and file name

http://www.idev101.com/code/User_Interface/launchImages.html

iPhone 4S 3.5" display --> Non-retina (320 x 480 pixels Default.png)     / Retina  ( 640 x 960 pixels Default@2x.png)
iPhone 5 4" display --> 640 x 1136 pixels Default-568h@2x.png