Jormungandr: Sort in reverse order in datetime represents arrival
Jormungandr: Add default parameter to clockwise on sort_journeys
Jormungandr: fix after rebase
Merge pull request #337 from l-vincent-l/NAVITIAII-796

Jormungandr: Sort in reverse order in datetime represents arrival
jormungandr: Modified for stat
jormungandr: Added for stat
stat_persistor: service to write stat added
jormungandr: StatManager initialized
jormungandr: StatManager removed
jormungandr: Import removed.
jormungandr: StatManager removed from InstanceManager
jormungandr: StatManager finalized.
stat_persistor: Module to insert statistiques
in the database finalized.
jormungandr: Stat_Manager modified
stat_persistor: Module to write in database finalized
stat_persistor: ForeignKey_Ids managed in sqlAlchemy
instead of database.
stat_persistor: Alembic files added for versionning
of stat database.
jormungandr: Commented lines deleted.
jormungandr: Stat_Manager configuration added.
jormungandr: Modifications in Stat_Manager
Error handling
Process of Reading