Uses a multi-threaded approach to download allele files

def download_loci(self):
        """
        Uses a multi-threaded approach to download allele files
        """
        # Setup the multiprocessing pool.
        pool = multiprocessing.Pool(processes=self.threads)
        # Map the list of loci URLs to the download method
        pool.map(self.download_threads, self.loci_url)
        pool.close()
        pool.join()