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
Documentation: change "sty_in" explanation
Merge pull request #537 from stifoon/crow_fly_doc

documentation: add crow_fly description
georef: remove useless rtree
georef: add find_admins and use it