added better db migration support than what Subsonic provides out of the box.

Migrator.net/Migrator.Framework/Loggers/IAttachableLogger.cs

@@ -0,0 +1,33 @@
+#region License
+//The contents of this file are subject to the Mozilla Public License
+//Version 1.1 (the "License"); you may not use this file except in
+//compliance with the License. You may obtain a copy of the License at
+//http://www.mozilla.org/MPL/
+//Software distributed under the License is distributed on an "AS IS"
+//basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
+//License for the specific language governing rights and limitations
+//under the License.
+#endregion
+
+namespace Migrator.Framework.Loggers
+{
+	/// <summary>
+	/// ILogger interface. 
+	/// Implicit in this interface is that the logger will delegate actual
+	/// logging to the <see cref="ILogWriter"/>(s) that have been attached
+	/// </summary>
+	public interface IAttachableLogger: ILogger
+	{
+		/// <summary>
+		/// Attach an <see cref="ILogWriter"/>
+		/// </summary>
+		/// <param name="writer"></param>
+		void Attach(ILogWriter writer);
+
+		/// <summary>
+		/// Detach an <see cref="ILogWriter"/>
+		/// </summary>
+		/// <param name="writer"></param>
+		void Detach(ILogWriter writer);
+	}
+}