add setting to control import of missing episodes

MediaBrowser.Model/Configuration/LibraryOptions.cs

@@ -13,6 +13,7 @@
 
         public bool SaveLocalMetadata { get; set; }
         public bool EnableInternetProviders { get; set; }
+        public bool ImportMissingEpisodes { get; set; }
 
         public LibraryOptions()
         {

MediaBrowser.Model/Configuration/UserConfiguration.cs

@@ -57,6 +57,7 @@ namespace MediaBrowser.Model.Configuration
 
             HidePlayedInLatest = true;
             PlayDefaultAudioTrack = true;
+            DisplayMissingEpisodes = true;
 
             LatestItemsExcludes = new string[] { };
             OrderedViews = new string[] { };