properly set layer scale for MapBox markers

@@ -144,12 +144,12 @@
     
     NSString *cachePath = [NSString stringWithFormat:@"%@/%@", kCachesPath, [imageURL lastPathComponent]];
     
-    if ((image = [UIImage imageWithContentsOfFile:cachePath]) && image)
+    if ((image = [UIImage imageWithData:[NSData dataWithContentsOfFile:cachePath] scale:(useRetina ? 2.0 : 1.0)]) && image)
         return [self initWithUIImage:image];
     
     [[NSFileManager defaultManager] createFileAtPath:cachePath contents:[NSData dataWithContentsOfURL:imageURL] attributes:nil];
     
-    return [self initWithUIImage:[UIImage imageWithContentsOfFile:cachePath]];
+    return [self initWithUIImage:[UIImage imageWithData:[NSData dataWithContentsOfFile:cachePath] scale:(useRetina ? 2.0 : 1.0)]];
 }
 
 - (void)dealloc