[ResolverSpec] Add spec covering the exclusion of subspec dependencies of incompatible platforms when there's only one target platform
[ResolverSpec] Add spec covering the exclusion of subspec dependencies of incompatible platforms when there's only one target platform

Done by using AFNetworking 2.4.1 and its UIKit subspec (iOS only) on an OS X platform

mglidden/CocoaPods,mglidden/CocoaPods,mglidden/CocoaPods