Issue patterns-group#92 - Fixed

* extracted ILoggingConfig from LoggingConfig
* switched to interface usage everywhere
* modified LoggingModule logic to allow config source to be unregistered /
  config section to be missing; either case results in a default instance
  of LoggingConfig to be registered

src/Patterns.Autofac/Logging/LoggingModule.cs

@@ -68,14 +68,15 @@ protected override void Load(ContainerBuilder builder)
 			{
 				try
 				{
-					var configSource = context.Resolve<IConfigurationSource>();
-					return configSource.GetSection<LoggingConfig>(LoggingConfig.SectionName);
+					var configSource = context.ResolveOptional<IConfigurationSource>();
+					var config = configSource != null ? configSource.GetSection<LoggingConfig>(LoggingConfig.SectionName) : null;
+					return config ?? new LoggingConfig();
 				}
 				catch (ComponentNotRegisteredException registrationError)
 				{
 					throw ErrorBuilder.BuildContainerException(registrationError, ConfigurationResources.MissingConfigSourceErrorHint);
 				}
-			});
+			}).As<ILoggingConfig>();
 			builder.RegisterType<LoggingInterceptor>();
 		}
 

src/Patterns/Logging/ILoggingConfig.cs

@@ -0,0 +1,38 @@
+#region FreeBSD
+
+// Copyright (c) 2013, John Batte
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+// 
+//  * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+// 
+//  * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+namespace Patterns.Logging
+{
+	/// <summary>
+	///    Defines configuration options for the Patterns.Logging namespace.
+	/// </summary>
+	public interface ILoggingConfig
+	{
+		/// <summary>
+		///    Gets or sets a value indicating whether the logging interceptor should trap exceptions
+		///    (as opposed to allowing them to bubble up).
+		/// </summary>
+		/// <value>
+		///    <c>true</c> if the logging interceptor should trap exceptions; otherwise, <c>false</c>.
+		/// </value>
+		bool TrapExceptions { get; set; }
+	}
+}

src/Patterns/Logging/LoggingConfig.cs

@@ -30,7 +30,7 @@ namespace Patterns.Logging
 	/// <summary>
 	/// Defines configuration options for the Patterns.Logging namespace.
 	/// </summary>
-	public class LoggingConfig : ConfigurationSection
+	public class LoggingConfig : ConfigurationSection, ILoggingConfig
 	{
 		/// <summary>
 		/// The default section name.

src/Patterns/Logging/LoggingInterceptor.cs

@@ -42,7 +42,7 @@ public class LoggingInterceptor : IInterceptor
 		private const string _argumentListFormat = "({0})";
 		private const string _argumentListSeparator = ",";
 		private const string _stringDisplayFormat = @"""{0}""";
-		private readonly LoggingConfig _config;
+		private readonly ILoggingConfig _config;
 		private readonly Func<Type, ILog> _logFactory;
 
 		private static readonly FuncStrategies<Type, object, object> _displayStrategies
@@ -58,7 +58,7 @@ public class LoggingInterceptor : IInterceptor
 		/// </summary>
 		/// <param name="config">The config.</param>
 		/// <param name="logFactory">The log factory.</param>
-		public LoggingInterceptor(LoggingConfig config, Func<Type, ILog> logFactory)
+		public LoggingInterceptor(ILoggingConfig config, Func<Type, ILog> logFactory)
 		{
 			_config = config;
 			_logFactory = logFactory;

src/Patterns/Patterns.csproj

@@ -71,6 +71,7 @@
     <Compile Include="Configuration\IConfigurationSource.cs" />
     <Compile Include="ExceptionHandling\ExceptionState.cs" />
     <Compile Include="ExceptionHandling\Try.cs" />
+    <Compile Include="Logging\ILoggingConfig.cs" />
     <Compile Include="Logging\LoggingConfig.cs" />
     <Compile Include="Logging\LoggingInterceptor.cs" />
     <Compile Include="Logging\LoggingResources.Designer.cs">