Enable StyleCop for MediaBrowser.Common

MediaBrowser.Common/Configuration/IValidatingConfiguration.cs

@@ -0,0 +1,15 @@
+namespace MediaBrowser.Common.Configuration
+{
+    /// <summary>
+    /// A configuration store that can be validated.
+    /// </summary>
+    public interface IValidatingConfiguration
+    {
+        /// <summary>
+        /// Validation method to be invoked before saving the configuration.
+        /// </summary>
+        /// <param name="oldConfig">The old configuration.</param>
+        /// <param name="newConfig">The new configuration.</param>
+        void Validate(object oldConfig, object newConfig);
+    }
+}