         }
     }
     
+    /**
+     Return image URL by desired size.
+     
+     - parameter imageSize: The desired image size, see ImageSize for options.
+     
+     - returns: Image URL string.
+     */
     func imageURLForSize(imageSize: ImageSize) -> String? {
         switch imageSize {
         case .Default:

        return fetchRequest
    }
    
    class func instancesForContentURLs(URLs: [String],
                                       managedObjectContext: NSManagedObjectContext) -> [Story]? {
        


class Story: NSManagedObject {

    /**
     Default fetch request for Story entities.
     
     Returns a fetch request configured to return Story entities, sorted by date created descending.
     
     - returns: NSFetchRequest instance for Story entities.
     */
    class func fetchRequest() -> NSFetchRequest {
        
        let fetchRequest = NSFetchRequest(entityName: String(Story))
