[racket] Json pretty-print

From: Danny Yoo (dyoo at hashcollision.org)
Date: Tue Apr 16 15:16:54 EDT 2013

Racket provides a generic order predicate: see data/order:

     http://docs.racket-lang.org/data/Orders_and_Ordered_Dictionaries.html

For example,

    https://gist.github.com/dyoo/5398549#file-pretty-print-json-rkt-L5
    https://gist.github.com/dyoo/5398549#file-pretty-print-json-rkt-L12
    https://gist.github.com/dyoo/5398549#file-pretty-print-json-rkt-L12

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