GBFS support (bike sharing systems)

[kresp0]

OTP already supports bike sharing routing using GBFS. It would be awesome if this works both automagically and by manually configuring it.

[kresp0]

It could use the csv from NABSA's github (or an improved version with automatically added bounding box coordinates)

[ellenhp]

Thanks for the link! I agree this is would be cool. I'm going to re-do the directions UI soon, and hopefully whatever I come up with can also work with minimal modifications to finish the trip planner. At that point I'll just have to tackle #122 then I think I'll be ready to add GBFS (and GTFS-RT probably!). I don't want transit to fall too far behind the rest of the routing modes.