Return a Result that doesn't print dots.

        Nose's ResultProxy will wrap it, and other plugins can still print
        stuff---but without smashing into our progress bar, care of
        ProgressivePlugin's stderr/out wrapping.

def _makeResult(self):
        """Return a Result that doesn't print dots.

        Nose's ResultProxy will wrap it, and other plugins can still print
        stuff---but without smashing into our progress bar, care of
        ProgressivePlugin's stderr/out wrapping.

        """
        return ProgressiveResult(self._cwd,
                                 self._totalTests,
                                 self.stream,
                                 config=self.config)