Updating podspec to 1.0RC4

AFNetworking.podspec

@@ -5,10 +5,23 @@ Pod::Spec.new do |s|
   s.summary  = 'A delightful iOS and OS X networking framework.'
   s.homepage = 'https://github.com/AFNetworking/AFNetworking'
   s.authors  = {'Mattt Thompson' => '[email protected]', 'Scott Raymond' => '[email protected]'}
-  s.source   = { :git => 'https://github.com/AFNetworking/AFNetworking.git', :tag => '1.0RC3' }
+  s.source   = { :git => 'https://github.com/AFNetworking/AFNetworking.git', :tag => '1.0RC4' }
   s.source_files = 'AFNetworking'
   s.requires_arc = true
 
-  s.framework = 'SystemConfiguration'
-  s.prefix_header_contents = "#import <SystemConfiguration/SystemConfiguration.h>"
+  s.ios.deployment_target = '5.0'
+  s.ios.frameworks = 'MobileCoreServices', 'SystemConfiguration'
+
+  s.osx.deployment_target = '10.7'
+  s.osx.frameworks = 'CoreServices', 'SystemConfiguration'
+
+  s.prefix_header_contents = <<-EOS
+#if __IPHONE_OS_VERSION_MIN_REQUIRED
+  #import <SystemConfiguration/SystemConfiguration.h>
+  #import <MobileCoreServices/MobileCoreServices.h>
+#else
+  #import <SystemConfiguration/SystemConfiguration.h>
+  #import <CoreServices/CoreServices.h>
+#endif
+EOS
 end