Major updates;

  * Shorten DefaultEndpoint "acceptancetest.*" -> "at.*".
  * Throw if queues not empty on completion IF not exceptions.
  * Better exception tracing and logging via log4net appender.
  * Move DefaultServer context dependencies to ScenarioContext.
  * Add IncludeNamespace overload to Builders' ScanningAssembly()
  * Add ExcludeNamespace method to Builder