fix portable and 3.5 project references

MediaBrowser.Model/Dto/SubtitleDownloadOptions.cs

@@ -0,0 +1,17 @@
+namespace MediaBrowser.Model.Dto
+{
+    public class SubtitleDownloadOptions
+    {
+        /// <summary>
+        /// Gets or sets the item identifier.
+        /// </summary>
+        /// <value>The item identifier.</value>
+        public string ItemId { get; set; }
+
+        /// <summary>
+        /// Gets or sets the index of the stream.
+        /// </summary>
+        /// <value>The index of the stream.</value>
+        public int StreamIndex { get; set; }
+    }
+}