improved app asset management and retrying to acquire

Limelight/Network/AppAssetRetriever.h

@@ -0,0 +1,21 @@
+//
+//  AppAssetRetriever.h
+//  Limelight
+//
+//  Created by Diego Waxemberg on 1/31/15.
+//  Copyright (c) 2015 Limelight Stream. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import "Host.h"
+#import "App.h"
+#import "AppAssetManager.h"
+
+@interface AppAssetRetriever : NSOperation
+
+@property (nonatomic) Host* host;
+@property (nonatomic) App* app;
+@property (nonatomic) NSMutableDictionary* cache;
+@property (nonatomic) id<AppAssetCallback> callback;
+
+@end