Django-atol

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* Change maximum retry counts for task `atol_receive_receipt_report`. Now its awaiting report for 29 hours.

* Changed `atol_retry_created_receipts` and `atol_retry_initiated_receipts` tasks retry period.
Now it will retry receipts from day before yesterday

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* AtolAPI.base_url specifying in settings

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* Support retried not processed receipt

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* Django 2.0 support

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* Initial release