documentation: add crow_fly description
Documentation: add image for crow_fly sections
Documentation: add stay_in section
Documentation: add stay_in section
Documentation: change stay_in and crow_fly schemas
Documentation: ajustement
ed

ed: remove "park_ride" poi type and add proportie "park_ride=yes/no" in poi properties
Merge pull request #545 from azime/manage-parking

ed
Tyr: add a family_type for each dataset

This way it's possible to find the lasts dataset loaded for each type od
data
Tyr: add a command for deleting old backup directories

For one instance:

    ./manage.py purge_instance fr-idf

For purging all the instances:

    ./manage.py purge_instances

The option "-b" can be use for run the task in background (with a
celery worker)
Documentation: change "sty_in" explanation
Merge pull request #537 from stifoon/crow_fly_doc

documentation: add crow_fly description
autocomplete: -warning
ed & georef: force using a parking when doing a car to stop area
georef: test parking
ed & georef: do bss as parking
Tyr: give the ability to keep more than one dataset when purging

but the request is a lot less sexy than before :p
Merge pull request #547 from kinnou02/tyr_purge

Tyr: add a command for deleting old backup directories
georef: fix rebase for modifications on nearest_edge
Merge pull request #528 from TeXitoi/parking

ed & georef: force using a parking when doing a car to stop area