title: Could not build module 'UIKit" in cocoapods since Xcode 5.1
body: <p>I cannot build my application anymore since I updated Xcode to the new version (Xcode 5.1).
  the error message is 'Could not build module 'UIKit''. 
  I have the same problems with my two pods:
  AFNetworking
  SDWebImage</p>
  
  <p>Any thought on this?</p>