Vehicle Specific Cost and Duration Factors

Nadie ha tomado este issue todavía.

At the moment we expose a single cost and duration matrix per vehicle. What we should allow for in the context of multiple vehicles is cost and duration factors on a per vehicle basis to scale the cost and duration matrix the user passes us, think

numVehicles: 3
costFactors: [1.0, 0.7, 1.5]
durationFactors: [1.0, 0.7, 1.5]

which would scale both the cost as well as the duration matrices depending on the factors for each vehicle. We need to separate cost and duration factors because users could specify e.g. distance as cost in which case `costFactors` would be `[1.0 1.0 1.0]` and `durationFactors` would account for slower and faster vehicles.

Related: Heterogeneous Fleets https://github.com/mapbox/node-or-tools/issues/11

cc @karenzshea

El issue no menciona archivos ni tests. Empieza siguiendo la API pública de vehicle-routing que acepta matrices de costes y duración, y después revisa el issue relacionado Heterogeneous Fleets (#11). La tarea estará terminada cuando varios vehículos puedan recibir costFactors y durationFactors separados que escalen las matrices correspondientes, con cobertura para el ejemplo de tres vehículos.

Escrito por el modelo de indexación a partir del texto del issue.