Method to get JsonNode with internal $ref pointers deferenced

[slinkydeveloper]

For more informations: #4

[slinkydeveloper]

Why you can't accept this PR?

[andylowry]

@slinkydeveloper I've reviewed this code, but I chose to go with a very different approach - much more in line with the advice I offered when you started this work. Please take a look at #4 and #82 for details.

I believe that what you were after is obtainable with model.toJson(true) (or more generally, obj.toJson(true), where obj could be a Schema or a Path or any other ObjectOverlay extension). The boolean param indicates whether embedded references should be followed (true) or appear as references in the result (false).

I'll close this PR at this point, but I appreciate your contributions, and I trust that your forked code was able to support your summer work, despite my unavailability. At this point, I believe/hope that master branch will support your needs.