XbmcProvider updated to include new Json API methods.

EventClient is used for sending CleanLibrary and Notifications (With NzbDrone Logo - Internal Resource).
Support for Dharma's HTTP Server (Deprecated), since Dharma doesn't support Json as well.

NzbDrone.Core/Model/Xbmc/Command.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace NzbDrone.Core.Model.Xbmc
+{
+    public class Command
+    {
+        public string jsonrpc
+        {
+            get { return "2.0"; }
+        }
+
+        public string method { get; set; }
+        public Params @params { get; set; }
+        public long id { get; set; }
+    }
+}