Summarize data

Please, check my code!
I forgot to include some kind of readme.st. To test custom command:
python manage.py summarize [date YYYY-MM-DD] [--nodeletion]
If you pass no parameters it summarizes current date minus 15 days (single day and no a 15-days period)
See this note about printing to the console in Django commands: https://docs.djangoproject.com/en/dev/howto/custom-management-commands/#management-commands-output