Added a bunch of missing unicode_literals

from __future__ import unicode_literals

import re

import datetime

    def add_to_migration(self, app_label, operation, new=False):

        migrations = self.migrations.setdefault(app_label, [])

        if not migrations or new:

            subclass = type("Migration", (Migration,), {"operations": [], "dependencies": []})

            subclass = type(str("Migration"), (Migration,), {"operations": [], "dependencies": []})

            instance = subclass("auto_%i" % (len(migrations) + 1), app_label)

            migrations.append(instance)

        migrations[-1].operations.append(operation)

from __future__ import unicode_literals

from django.db import migrations

from .loader import MigrationLoader

from .recorder import MigrationRecorder

from __future__ import unicode_literals

from django.utils.datastructures import OrderedSet

from django.db.migrations.state import ProjectState

from __future__ import unicode_literals

from importlib import import_module

import os

import sys

from __future__ import unicode_literals

class Migration(object):

    """

    The base class for all migrations.