Upgraded Protobuf, and added api support for it

MediaBrowser.Model/DTO/PluginInfo.cs

@@ -1,17 +1,30 @@
 using System;
+using ProtoBuf;
 
 namespace MediaBrowser.Model.DTO
 {
     /// <summary>
     /// This is a serializable stub class that is used by the api to provide information about installed plugins.
     /// </summary>
+    [ProtoContract]
     public class PluginInfo
     {
+        [ProtoMember(1)]
         public string Name { get; set; }
+
+        [ProtoMember(2)]
         public string Path { get; set; }
+
+        [ProtoMember(3)]
         public bool Enabled { get; set; }
+
+        [ProtoMember(4)]
         public bool DownloadToUI { get; set; }
+
+        [ProtoMember(5)]
         public DateTime ConfigurationDateLastModified { get; set; }
+
+        [ProtoMember(6)]
         public Version Version { get; set; }
     }
 }