fix double path concatenation

MediaBrowser.Model/ApiClient/IApiClient.cs

@@ -859,6 +859,14 @@ namespace MediaBrowser.Model.ApiClient
         /// <returns>System.String.</returns>
         string GetArtImageUrl(BaseItemDto item, ImageOptions options);
 
+        /// <summary>
+        /// Gets the thumb image URL.
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <param name="options">The options.</param>
+        /// <returns>System.String.</returns>
+        string GetThumbImageUrl(BaseItemDto item, ImageOptions options);
+        
         /// <summary>
         /// Gets the url needed to stream an audio file
         /// </summary>

MediaBrowser.Model/Dto/BaseItemDto.cs

@@ -468,6 +468,30 @@ namespace MediaBrowser.Model.Dto
         /// </summary>
         /// <value>The parent art image tag.</value>
         public Guid? ParentArtImageTag { get; set; }
+
+        /// <summary>
+        /// Gets or sets the series thumb image tag.
+        /// </summary>
+        /// <value>The series thumb image tag.</value>
+        public Guid? SeriesThumbImageTag { get; set; }
+
+        /// <summary>
+        /// Gets or sets the series studio.
+        /// </summary>
+        /// <value>The series studio.</value>
+        public string SeriesStudio { get; set; }
+        
+        /// <summary>
+        /// Gets or sets the parent thumb item id.
+        /// </summary>
+        /// <value>The parent thumb item id.</value>
+        public string ParentThumbItemId { get; set; }
+
+        /// <summary>
+        /// Gets or sets the parent thumb image tag.
+        /// </summary>
+        /// <value>The parent thumb image tag.</value>
+        public Guid? ParentThumbImageTag { get; set; }
         
         /// <summary>
         /// Gets or sets the chapters.

MediaBrowser.Model/Querying/ItemSortBy.cs

@@ -83,5 +83,6 @@ namespace MediaBrowser.Model.Querying
         public const string MusicVideoCount = "MusicVideoCount";
         public const string SeriesSortName = "SeriesSortName";
         public const string VideoBitRate = "VideoBitRate";
+        public const string AirTime = "AirTime";
     }
 }