parameterise_wheelchair_data WIP
Added includeWheelchairData request parameter.

trip.wheelchairAccessible is now only included in REST responses if the
includeWheelchairData request flag is set
Fixed some actions; incremented serial IDs

Added missing includeWheelchairData request parameter to
ArrivalAndDepartureForStopAction, ArrivalsAndDeparturesForStopAction
and EstimateCurrentVehicleAction.

Incremented serial IDs for classes changed since the last deployment, so
the next deployment makes more sense (there'll be cache errors instead
of general weirdness, so we'll blow the cache if we forget).