fixes #582 - support tbn image files.

MediaBrowser.Common/Net/MimeTypes.cs

@@ -135,7 +135,7 @@ namespace MediaBrowser.Common.Net
             {
                 return "image/gif";
             }
-            if (ext.Equals(".jpg", StringComparison.OrdinalIgnoreCase) || ext.Equals(".jpeg", StringComparison.OrdinalIgnoreCase))
+            if (ext.Equals(".jpg", StringComparison.OrdinalIgnoreCase) || ext.Equals(".jpeg", StringComparison.OrdinalIgnoreCase) || ext.Equals(".tbn", StringComparison.OrdinalIgnoreCase))
             {
                 return "image/jpeg";
             }

MediaBrowser.Controller/Entities/BaseItem.cs

@@ -52,7 +52,7 @@ namespace MediaBrowser.Controller.Entities
         /// <summary>
         /// The supported image extensions
         /// </summary>
-        public static readonly string[] SupportedImageExtensions = new[] { ".png", ".jpg", ".jpeg" };
+        public static readonly string[] SupportedImageExtensions = new[] { ".png", ".jpg", ".jpeg", ".tbn" };
 
         /// <summary>
         /// The trailer folder name