Add CFNetwork header to make iphone targets build out of the box in release configuration

Use removeItemAtPath rather than removeFileAtPath to get rid of warning when targeting iphone

@@ -10,6 +10,7 @@
 //  Portions are based on the ImageClient example from Apple:
 //  See: http://developer.apple.com/samplecode/ImageClient/listing37.html
 
+#import <CFNetwork/CFNetwork.h>
 
 typedef enum _ASINetworkErrorType {
     ASIConnectionFailureErrorType = 1,

@@ -390,7 +390,7 @@ static NSError *ASIUnableToCreateRequestError;
 	// If we were downloading to a file, let's remove it
 	} else if (downloadDestinationPath) {
 		[outputStream close];
-		[[NSFileManager defaultManager] removeFileAtPath:downloadDestinationPath handler:nil];
+		[[NSFileManager defaultManager] removeItemAtPath:downloadDestinationPath error:NULL];
 	}
 	
 	[self setResponseHeaders:nil];