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

SDWebImage/MKAnnotationView+WebCache.m

@@ -63,9 +63,12 @@
 #endif
 
 - (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

@@ -128,9 +128,12 @@
 
 
 - (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

@@ -63,9 +63,12 @@
 #endif
 
 - (void)cancelCurrentImageLoad
+{
+    @synchronized(self)
     {
         [[SDWebImageManager sharedManager] cancelForDelegate:self];
     }
+}
 
 - (void)webImageManager:(SDWebImageManager *)imageManager didProgressWithPartialImage:(UIImage *)image forURL:(NSURL *)url
 {