Extract JsonPath

[bflorac]

It would a handy feature to be able to extract the JsonPath from an object. As as you add items, you can save path to the object for later reference. While one can build this on the fly, it would be better to the the path formatted exactly as needs to be called back as. There seemd to be some flexibility take by others in how the path is formatted (that don't work here) so it would be good to just get it correct and not have to figure it out.