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refactor database reset on test's teardown (#42)

* remove unnecessary Migrator.reset() calls

There is no need to run ``Migrator.reset()`` method in both cases,
because database is already cleaned with ``flush`` management command:

+ in ``MigratorTestCase``, it is subclass of ``TransactionTestCase``
  and doesn't override any method that shadow test's teardown method
+ in ``migrator_factory``, it uses ``transactional_db`` fixture
  which clean database

* use flush management command to reset database after migration test

``flush`` management command is used by Django's
``TransactionTestCase``.
Flush only database tested by ``Migrator`` instance.

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