Add GPL modules

MediaBrowser.Common/Configuration/IConfigurationFactory.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+
+namespace MediaBrowser.Common.Configuration
+{
+    public interface IConfigurationFactory
+    {
+        IEnumerable<ConfigurationStore> GetConfigurations();
+    }
+
+    public class ConfigurationStore
+    {
+        public string Key { get; set; }
+
+        public Type ConfigurationType { get; set; }
+    }
+
+    public interface IValidatingConfiguration
+    {
+        void Validate(object oldConfig, object newConfig);
+    }
+}