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