Cannot run migrations on postgres with a custom user model on a clean database

Hi
It seems that django is creating all of postman's tables before migrations are run for the remaining apps which contain custom User model that postman depends on.
This seems to be due to postman not using migrations.
Creating migrations for postman using 'python manage.py makemigrations postman' solves the problem.
Migrate output with sql output enabled in logging settings:
# python manage.py migrate -v3
[24/Jun/2015 06:49:21] DEBUG [django.db.backends:89] (0.003) 
            SELECT c.relname, c.relkind
            FROM pg_catalog.pg_class c
            LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
            WHERE c.relkind IN ('r', 'v')
                AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
                AND pg_catalog.pg_table_is_visible(c.oid); args=None
[24/Jun/2015 06:49:21] DEBUG [django.db.backends:89] (0.001) SELECT "django_migrations"."app", "django_migrations"."name" FROM "django_migrations"; args=()
Operations to perform:
  Synchronize unmigrated apps: staticfiles, messages, postman
  Apply all migrations: admin, contenttypes, testapp, auth, sessions
Synchronizing apps without migrations:
[24/Jun/2015 06:49:21] DEBUG [django.db.backends:89] (0.001) 
            SELECT c.relname, c.relkind
            FROM pg_catalog.pg_class c
            LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
            WHERE c.relkind IN ('r', 'v')
                AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
                AND pg_catalog.pg_table_is_visible(c.oid); args=None
Running pre-migrate handlers for application admin
Running pre-migrate handlers for application auth
Running pre-migrate handlers for application contenttypes
Running pre-migrate handlers for application sessions
Running pre-migrate handlers for application postman
Running pre-migrate handlers for application testapp
  Creating tables...
    Processing postman.Message model
[24/Jun/2015 06:49:21] DEBUG [django.db.backends:89] (0.001) SAVEPOINT "s139702074087232_x1"; args=None
    Creating table postman_message
[24/Jun/2015 06:49:21] DEBUG [django.db.backends.schema:102] CREATE TABLE "postman_message" ("id" serial NOT NULL PRIMARY KEY, "subject" varchar(120) NOT NULL, "body" text NOT NULL, "sender_id" integer NULL, "recipient_id" integer NULL, "email" varchar(254) NOT NULL, "parent_id" integer NULL, "thread_id" integer NULL, "sent_at" timestamp with time zone NOT NULL, "read_at" timestamp with time zone NULL, "replied_at" timestamp with time zone NULL, "sender_archived" boolean NOT NULL, "recipient_archived" boolean NOT NULL, "sender_deleted_at" timestamp with time zone NULL, "recipient_deleted_at" timestamp with time zone NULL, "moderation_status" varchar(1) NOT NULL, "moderation_by_id" integer NULL, "moderation_date" timestamp with time zone NULL, "moderation_reason" varchar(120) NOT NULL); (params None)
[24/Jun/2015 06:49:21] DEBUG [django.db.backends:89] (0.022) CREATE TABLE "postman_message" ("id" serial NOT NULL PRIMARY KEY, "subject" varchar(120) NOT NULL, "body" text NOT NULL, "sender_id" integer NULL, "recipient_id" integer NULL, "email" varchar(254) NOT NULL, "parent_id" integer NULL, "thread_id" integer NULL, "sent_at" timestamp with time zone NOT NULL, "read_at" timestamp with time zone NULL, "replied_at" timestamp with time zone NULL, "sender_archived" boolean NOT NULL, "recipient_archived" boolean NOT NULL, "sender_deleted_at" timestamp with time zone NULL, "recipient_deleted_at" timestamp with time zone NULL, "moderation_status" varchar(1) NOT NULL, "moderation_by_id" integer NULL, "moderation_date" timestamp with time zone NULL, "moderation_reason" varchar(120) NOT NULL); args=None
[24/Jun/2015 06:49:21] DEBUG [django.db.backends:89] (0.000) RELEASE SAVEPOINT "s139702074087232_x1"; args=None
    Running deferred SQL...
[24/Jun/2015 06:49:21] DEBUG [django.db.backends:89] (0.007) ALTER TABLE "postman_message" ADD CONSTRAINT "postman_message_sender_id_3031ea7b2c020912_fk_testapp_myuser_id" FOREIGN KEY ("sender_id") REFERENCES "testapp_myuser" ("id") DEFERRABLE INITIALLY DEFERRED; args=None
Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/gert/.virtualenvs/test/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/home/gert/.virtualenvs/test/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/gert/.virtualenvs/test/local/lib/python2.7/site-packages/django/core/management/base.py", line 390, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/gert/.virtualenvs/test/local/lib/python2.7/site-packages/django/core/management/base.py", line 441, in execute
    output = self.handle(*args, **options)
  File "/home/gert/.virtualenvs/test/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 179, in handle
    created_models = self.sync_apps(connection, executor.loader.unmigrated_apps)
  File "/home/gert/.virtualenvs/test/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 317, in sync_apps
    cursor.execute(statement)
  File "/home/gert/.virtualenvs/test/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 79, in execute
    return super(CursorDebugWrapper, self).execute(sql, params)
  File "/home/gert/.virtualenvs/test/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "/home/gert/.virtualenvs/test/local/lib/python2.7/site-packages/django/db/utils.py", line 97, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/home/gert/.virtualenvs/test/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 62, in execute
    return self.cursor.execute(sql)
django.db.utils.ProgrammingError: relation "testapp_myuser" does not exist
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