Remove -saveMetadata from FICImageTable header, and always call -saveMetadata when deleting

Author: Mallory Paine

FastImageCache/FICImageCache.m

@@ -368,10 +368,8 @@ - (BOOL)imageExistsForEntity:(id <FICEntity>)entity withFormatName:(NSString *)f
 
 - (void)deleteImageForEntity:(id <FICEntity>)entity withFormatName:(NSString *)formatName {
     FICImageTable *imageTable = [_imageTables objectForKey:formatName];
-    NSString *entityUUID = [entity UUID];
-    
+    NSString *entityUUID = [entity UUID];    
     [imageTable deleteEntryForEntityUUID:entityUUID];
-    [imageTable saveMetadata];
 }
 
 - (void)cancelImageRetrievalForEntity:(id <FICEntity>)entity withFormatName:(NSString *)formatName {

FastImageCache/FICImageTable.h

@@ -150,20 +150,6 @@ extern NSString *const FICImageTableScreenScaleKey;
  */
 - (BOOL)entryExistsForEntityUUID:(NSString *)entityUUID sourceImageUUID:(NSString *)sourceImageUUID;
 
-///---------------------------------------
-/// @name Saving an Image Table's Metadata
-///---------------------------------------
-
-/**
- Saves the image table's metadata to disk.
- 
- @discussion `FICImageTable` objects load their metadata from disk when they are initialized. If the deserialized dictionary representation for an image table's image format does not
- match the current dictionary representation, then the image table is invalid. The image table is deleted and a new one is created from the modified image format.
- 
- @see [FICImageFormat dictionaryRepresentation]
- */
-- (void)saveMetadata;
-
 ///--------------------------------
 /// @name Resetting the Image Table
 ///--------------------------------

FastImageCache/FICImageTable.m

@@ -330,7 +330,6 @@ - (UIImage *)newImageForEntityUUID:(NSString *)entityUUID sourceImageUUID:(NSStr
                 if (entityUUIDIsCorrect == NO || sourceImageUUIDIsCorrect == NO) {
                     // The UUIDs don't match, so we need to invalidate the entry.
                     [self deleteEntryForEntityUUID:entityUUID];
-                    [self saveMetadata];
                 } else {
                     [self _entryWasAccessedWithEntityUUID:entityUUID];
 
@@ -399,6 +398,7 @@ - (void)deleteEntryForEntityUUID:(NSString *)entityUUID {
             if (index != NSNotFound) {
                 [_MRUEntries removeObjectAtIndex:index];
             }
+            [self saveMetadata];
         }
 
         [_lock unlock];
@@ -423,7 +423,6 @@ - (BOOL)entryExistsForEntityUUID:(NSString *)entityUUID sourceImageUUID:(NSStrin
         if (entityUUIDIsCorrect == NO || sourceImageUUIDIsCorrect == NO) {
             // The source image UUIDs don't match, so the image data should be deleted for this entity.
             [self deleteEntryForEntityUUID:entityUUID];
-            [self saveMetadata];
             entryData = nil;
         }
     }