Notify user in real-time when they should exit the vehicle

[barbeau]

It should be noted that we (USF) implemented this feature in a closed-source project, specifically for individuals with disabilities (i.e., the Travel Assistance Device (TAD) mobile app - see YouTube video).

As part of this, USF owns two U.S. Patents (US 8,138,907 and US 8,169,342) on the technology that was developed. So, this is going to be a bit tricky - we either need to get permission from USF to use the above patented-technology, or come up with a new method.

One possibility is to develop a plug-in model, where different implementations to notify the user could be used. The USF technology could be one of those plugins.

I'd like to see all implementations and a plugin model use JSR293 Location API 2.0 as the main interface design. We used this interface design with TAD, and it worked well. JSR293 is generalized well to different modes, so it can be used as part of the real-time nav implementation (#297) as well.

Also, it should be noted that OneBusAway Android currently implements reminders for when to board the transit vehicle - perhaps OneBusAway Android would be a better place to implement this (see OneBusAway/onebusaway-android#17), unless we implement this as part of real-time nav in OTP Android (#297).