de-normalize item by name data. create counts during library scan for fast access.

MediaBrowser.Model/ApiClient/IApiClient.cs

@@ -28,6 +28,8 @@ namespace MediaBrowser.Model.ApiClient
         /// </summary>
         event EventHandler<HttpResponseEventArgs> HttpResponseReceived;
 
+        Task<T> GetAsync<T>(string url, CancellationToken cancellationToken);
+
         /// <summary>
         /// Gets the critic reviews.
         /// </summary>