Fix crash condition + invalid image orientation (fix #206)

SDWebImage/MKAnnotationView+WebCache.m

@@ -64,7 +64,10 @@
 
 - (void)cancelCurrentImageLoad
 {
+    @synchronized(self)
+    {
         [[SDWebImageManager sharedManager] cancelForDelegate:self];
+    }
 }
 
 - (void)webImageManager:(SDWebImageManager *)imageManager didProgressWithPartialImage:(UIImage *)image forURL:(NSURL *)url

SDWebImage/SDWebImageCompat.h

@@ -83,7 +83,7 @@ NS_INLINE UIImage *SDScaledImageForPath(NSString *path, NSObject *imageOrData)
             }
         }
 
-        UIImage *scaledImage = [[UIImage alloc] initWithCGImage:image.CGImage scale:scale orientation:UIImageOrientationUp];
+        UIImage *scaledImage = [[UIImage alloc] initWithCGImage:image.CGImage scale:scale orientation:image.imageOrientation];
         SDWISafeRelease(image)
         image = scaledImage;
     }

SDWebImage/UIButton+WebCache.m

@@ -129,7 +129,10 @@
 
 - (void)cancelCurrentImageLoad
 {
+    @synchronized(self)
+    {
         [[SDWebImageManager sharedManager] cancelForDelegate:self];
+    }
 }
 
 - (void)webImageManager:(SDWebImageManager *)imageManager didProgressWithPartialImage:(UIImage *)image forURL:(NSURL *)url userInfo:(NSDictionary *)info

SDWebImage/UIImageView+WebCache.m

@@ -64,7 +64,10 @@
 
 - (void)cancelCurrentImageLoad
 {
+    @synchronized(self)
+    {
         [[SDWebImageManager sharedManager] cancelForDelegate:self];
+    }
 }
 
 - (void)webImageManager:(SDWebImageManager *)imageManager didProgressWithPartialImage:(UIImage *)image forURL:(NSURL *)url