fix portable and 3.5 project references

MediaBrowser.Model/Session/PlaystateRequest.cs

@@ -0,0 +1,15 @@
+namespace MediaBrowser.Model.Session
+{
+    public class PlaystateRequest
+    {
+        public PlaystateCommand Command { get; set; }
+
+        public long? SeekPositionTicks { get; set; }
+
+        /// <summary>
+        /// Gets or sets the controlling user identifier.
+        /// </summary>
+        /// <value>The controlling user identifier.</value>
+        public string ControllingUserId { get; set; }
+    }
+}