r7kamura/rack-multiplexer — pull request #1 by mrkn (2013-11-26 16:26:06+00:00)
Title: Use default_not_found_application method

Use `default_not_found_application` method to specify the default value of `not_found_application` instead of `DEFAULT_NOT_FOUND_APPLICATION` constant.
And `DEFAULT_NOT_FOUND_APPLICATION` is removed because it is no longer needed.