returns a json-dump from a geojson file
     
    Dump_From_GeoJson(url_file)
    Arguments
    
    
    
      | url_file | 
      either a string specifying the input path to a file OR a valid url (beginning with 'http..') pointing to a geojson object  | 
    
    
    Value
    a character string (json dump)
    Examples