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)
You probably want to ignore ```*.swp``` swap files too.

Here is my global gitignore, in case you find something useful.  You don't need all of it, so ignore a line if you don't know what it is:

```
*.LOCAL
*.REMOTE
*.bak
*.key
*.obj
*.old
*.orig
*.pyc
*.swp
*~
.DS_Store
.Python
.gaedata
.svn
DS_Store
bin
build
bundle
gitconfig-local
include
lib
settings_local.py
static_root
```