Wrap: Trip with Fixed Start and End points (TFSE)

[daniel-j-h]

TFSE needs to be implemented in the node-osrm plugin.
Re-using the existing Trip function should be possible.

Upstream

• Issue Project-OSRM/osrm-backend#1623
• Pull Request Project-OSRM/osrm-backend#3408

API

• coordinates
• source {first|any} first implies source = coordinates[0]
• destination {last|any} last implies destination = coordinates[coordinates.size() - 1]
• roundtrip {false|true}

Tasks:

• node_osrm.cpp adapt comments
• node_osrm_support.hpp parse into TripParameters
• docs/api.md adapt, add example
• trip.js tests

[daniel-j-h]

This was done in #296.