Django-cron

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- Python 3 compatibility.

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- Added database connection close.

- Added better exceptions handler.

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- Added index_together entries for faster queries on large cron log db tables.

- Upgraded requirement hence to Django 1.5 and South 0.8.1 since ``index_together`` is new to Django 1.5

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- Added Django 1.4+ support. Updated requirements.

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- Changed log level to debug() in CronJobManager.run() function.

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- Bug fix

- Optimized queries. Used latest() instead of order_by()