JsonUtil conversion to command line utility

usage: JsonUtil Json utility for concrete.
                
 -fc,--from-concrete    Given a concrete file, print the json
                        representation.
 -h,--help              dislay this help and exit
 -jp,--just-passages    Given a concrete file, return just the sections
                        marked as PASSAGE.(not yet implemented)
 -js,--just-sentences   Given a concrete file, return just the sentences
                        in json format.(not yet implemented)
 -tc,--to-concrete      Given a json file (A file that contains a json
                        string on the first line), save the concrete
                        object equivalent.
 -uuid,--uuid           Specify the exact uuid of the Concrete object.(not
                        yet implemented)
 -v,--validate          If to-concrete then check the key/value pairs.
JsonUtil handles concrete objects and converts them to and from json.
Specify the functions you would like to perform.
If going to Concrete, include a json filename and desired concrete
filename for output.
If going from Concrete, include a concrete filename alone.