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)
I don't think you should put more than one variable declaration in one line just to save lines:

```python
YEAR = 0
WEEK = 1
WEEKDAY = 2
```