enable admin interface for bds
Fill bds.models with the required fields; add migration scripts, and a stupid unittests that checks the model really works. Note: old fields will migrate to datetime.now().
Creating profiles for BDS, COF and K-Fêt.
- `cof` is renamed `gestioCOF` - `gestioncof` become `cof` (yes it looks pretty stupid but it is not) - `bds` is created
