Improve logging and fix arm64 warnings when printing integers with %d

@@ -8,6 +8,10 @@
 
 #import "SDWebImagePrefetcher.h"
 
+#if !defined(DEBUG) && !defined (SD_VERBOSE)
+#define NSLog(...)
+#endif
+
 @interface SDWebImagePrefetcher ()
 
 @property (strong, nonatomic) SDWebImageManager *manager;
@@ -60,17 +64,13 @@
             if (self.progressBlock) {
                 self.progressBlock(self.finishedCount,[self.prefetchURLs count]);
             }
-#ifdef SD_VERBOSE
-            NSLog(@"Prefetched %d out of %d", self.finishedCount, self.prefetchURLs.count);
-#endif
+            NSLog(@"Prefetched %@ out of %@", @(self.finishedCount), @(self.prefetchURLs.count));
         }
         else {
             if (self.progressBlock) {
                 self.progressBlock(self.finishedCount,[self.prefetchURLs count]);
             }
-#ifdef SD_VERBOSE
-            NSLog(@"Prefetched %d out of %d (Failed)", self.finishedCount, [self.prefetchURLs count]);
-#endif
+            NSLog(@"Prefetched %@ out of %@ (Failed)", @(self.finishedCount), @(self.prefetchURLs.count));
 
             // Add last failed
             self.skippedCount++;
@@ -100,9 +100,7 @@
 
 - (void)reportStatus {
     NSUInteger total = [self.prefetchURLs count];
-#ifdef SD_VERBOSE
-    NSLog(@"Finished prefetching (%d successful, %d skipped, timeElasped %.2f)", total - self.skippedCount, self.skippedCount, CFAbsoluteTimeGetCurrent() - self.startedTime);
-#endif
+    NSLog(@"Finished prefetching (%@ successful, %@ skipped, timeElasped %.2f)", @(total - self.skippedCount), @(self.skippedCount), CFAbsoluteTimeGetCurrent() - self.startedTime);
     if ([self.delegate respondsToSelector:@selector(imagePrefetcher:didFinishWithTotalCount:skippedCount:)]) {
         [self.delegate imagePrefetcher:self
                didFinishWithTotalCount:(total - self.skippedCount)