Load descriptive output meta data from a JSON file in the input directory.

def load_output_meta(self):
        """
        Load descriptive output meta data from a JSON file in the input directory.
        """
        options = self.options
        file_path = os.path.join(options.inputdir, 'output.meta.json')
        with open(file_path) as infile:
            return json.load(infile)