vehicle signal client specification(JS API)

Hi All,

I've write a part of possible implementation of vscs. It parses (bit  
modified) vss.json spec and re-builds a vehicle object model tree.
For instance, it enables developers to access the state of front left  
door by:

vehicle.Cabin.Door.Row1.Left.get(callback)
or with using promise,
vehicle.Cabin.Door.Row1.Left.get().then(callback).

On this VMO tree, we could apply query search that we discussed at f2f.

What I would like to propose for vscs by this poc is:

0. should be easy-to-use much as possible
1. use object chain instead of string so that IDE or debugger offers  
completion
2. should support Promise for 'get' and 'set' so that it will be easier  
to have access with more than two datapoints at a time

Regards,
Junichi

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