Allow migrations to be loaded from zipped packages

import os

import sys

from importlib import import_module

from pkg_resources import resource_listdir

from django.apps import apps

from django.conf import settings

            directory = os.path.dirname(module.__file__)

            # Scan for .py files

            migration_names = set()

            for name in os.listdir(directory):

            for name in resource_listdir(module_name, '.'):

                if name.endswith(".py"):

                    import_name = name.rsplit(".", 1)[0]

                    if import_name[0] not in "_.~":