Cities: add alchemy schemes
Cities: init
Cities: changed set to unordered map
Cities: remove useless dependencies
Cities: change namespace to navitia::cities
Cities: use find_or_default
Cities: add requirements.txt
Cities: change setting file
Cities: install alembic files
Cities: debian install
Tyr: add cities
Tyr: add command
Cities: in command return the return of cities
Merge pull request #546 from l-vincent-l/connector_cities

Connector cities
Tyr: rename last migration for adding the revision number in the filename
Tyr: add a command for rebuild all the current data of an instance

the command is:

    ./manage_tyr.py import_last_dataset instance
Merge pull request #549 from kinnou02/tyr_rebina

Tyr: add a command for rebuild all the current data of an instance
Jormungandr: fiw the error message when one instance is dead
Merge pull request #551 from kinnou02/fix_error_jormun

Jormungandr: fiw the error message when one instance is dead
nav2rt: usage of log4cplus and translation of logs