Executes the command.

def execute(self):
        """
        Executes the command.
        """
        from vsgen.util.logger import VSGLogger

        VSGLogger.info(self._logname, self._message)
        start = time.clock()
        VSGWriter.write(self._writables, self._parallel)
        end = time.clock()
        VSGLogger.info(self._logname, "Wrote %s files in %s seconds:", len(self._writables), end - start)