I have modified an old photoshop script to create icons that have a size that matches the requirements in xcode 5.2
https://gist.github.com/derpest/8437300
Adding the correct icon to the correct place stops the errors upon validating to push to store.
A good explanation of this is explained here: 'Missing recommended icon file - The bundle does not contain an app icon for iPhone / iPod Touch of exactly '120x120' pixels, in .png format'