Kraken: Remove unused properties on stoptime, and shrink another

Remove name and visible.
Shrinl local_traffic_zone to 16bits.
Closing amqp connection
Avoid connection_closed_abruptly message in rabbitmq log
Fix message typo too by adding a space
Kraken: Remove Id

the Id variable was never used and was the same as the uri.
Merge pull request #314 from guikcd/connector_at_connection_closed_abruptly

Closing amqp connection
Merge pull request #316 from antoine-de/work_on_memory

Work on memory consumption
Kraken: change georef duration to int 32

since we don't need the microsecond precision for georef, creation of a
navitia::time_duration based on int32.
Kraken: remove of callgrind define
Kraken: corrections after review