Update model for Liveboard arrivals

[tjorim]

Only looked at the default (departures) till now.
The response is different for arrivals.
Has no departures (duh) and also no occupancy.
What if I use id instead of station, specific date/time instead of current, include alerts or not...
Also check for connections, arrival instead of departure, impact of typeOfTransport

[tjorim]

Liveboard arrivals was done in 0fc3e51