added modular configuration

MediaBrowser.Common/Configuration/ConfigurationUpdateEventArgs.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace MediaBrowser.Common.Configuration
+{
+    public class ConfigurationUpdateEventArgs : EventArgs
+    {
+        /// <summary>
+        /// Gets or sets the key.
+        /// </summary>
+        /// <value>The key.</value>
+        public string Key { get; set; }
+        /// <summary>
+        /// Gets or sets the new configuration.
+        /// </summary>
+        /// <value>The new configuration.</value>
+        public object NewConfiguration { get; set; }
+    }
+}