fix linking with clang

boost::optional<std::string> destructor was not generated
do not index (for autocomplete) way without city associated

fix http://jira.canaltp.fr/browse/NAVITIAII-1359
-warning clang
Cmake: remove worker dependency to fill_disruption_from_database

because fill_disruption_from_database is used by ed, so we had a
tcmalloc dependency to ed
ed: fix bad admin with cities
Doc: add doc on tyr handling of authentication
Doc: add information about tyr install
Doc: add example
Doc: small correction
jormungandr: when sorting by departure, we always sort by departure
Kraken: In car we go to a parking and we park in it
Jormungandr: add CORS support
Jormungandr: enhance CORS configuration
tyr: add configuration for minium duration of bss in destineo
destineo: add a minimum duration for the bss fallback
tyr: set the default value for "destineo_min_bike" at 4 minutes

This will only change the value for newly created instance.
With 5 minutes there was something like 200 meters that was not covered
by the walk and the bike.
Fix arrival at isochron