#set() should make available the 'paths' being set, or provide the pathSet object

[jhamlet]

The API Documentation indicates that a JSONGraphEnvelope is passed as the only argument. However, it appears that just the jsonGraph property of that object is passed along to a route's set function.

It would be convenient to provide the full JSONGraphEnvelope with the 'paths' property for easier introspection of the object that contains the tree of values to set.

The router does the work of determining what paths are being set and then calling the appropriate route method, it would be nice to take advantage of that work (either as 'paths' in the envelope, or by passing the pathSet object) when that method is being called.