Fix some typos/misses (fix #119)

@@ -61,7 +61,7 @@ NS_INLINE UIImage *SDScaledImageForPath(NSString *path, NSObject *imageOrData)
     {
         image = [[UIImage alloc] initWithData:(NSData *)imageOrData];
     }
-    else if ([imageOrData isKindOfClass:[NSData class]])
+    else if ([imageOrData isKindOfClass:[UIImage class]])
     {
         image = SDWIReturnRetained((UIImage *)imageOrData);
     }

@@ -8,6 +8,7 @@
 
 #import <Foundation/Foundation.h>
 #import "SDWebImageManagerDelegate.h"
+#import "SDWebImageManager.h"
 
 /**
  * Prefetch some URLs in the cache for future use. Images are downloaded in low priority.

@@ -19,6 +19,7 @@ static SDWebImagePrefetcher *instance;
 
 @synthesize prefetchURLs;
 @synthesize maxConcurrentDownloads;
+@synthesize options;
 
 + (SDWebImagePrefetcher *)sharedImagePrefetcher
 {