Add method to Style to deduce foreground color from background color.
Trip.Leg is supposed to be subclassed.
Implement Paris provider based on abstract Navitia provider.

  * Rely on Navitia web interface.
  * Implement AbstractNavitiaProvider.
  * Implement ParisProvider.
  * Add ParisProviderLiveTest test class.
Fix some issues after first review.

  * Move Paris provider ID under France section.
  * Remove unnecessary sysouts in paris provider test.
  * Throw exception when parsing date.
  * Throw exception when parsing leg.
[Navitia] Mofidy tests to always use current date.
Add some @Override
[Navitia] Pass new authorization key when scraping url.

  * Define new scrape functions in ParserUtils.
  * Pass authorization key when scraping urls in navitia provider.
[Navitia] Update region name for Paris provider.
Exchange arguments in assertEquals.
[Paris] Fix poi name.
[Navitia] Handle stop area case when parsing location.
[Paris] Change start and end points in test.
Move authorization to Secrets.java.
Rename autocomplete->suggestLocations.
Handle invalid station when querying departures.
[Navitia] Handle invalid locations in queryDepartures and queryTrips.
[Paris] Add tests for unknown locations.
[Navitia] Handle FileNotFound exceptions in queryTrips and queryDepartures.
fixup! [Navitia] Handle FileNotFound exceptions in queryTrips and queryDepartures.
[Navitia] Avoid catching IOException.