def converter_options(inputformat ="", outputformat = "")
      response = @conversion_connection.get "conversiontypes", {:inputformat => inputformat,:outputformat => outputformat }
      parse_response(response.body)
    end
def converter_options(inputformat ="", outputformat = "")
      response = @conversion_connection.get "conversiontypes", {:inputformat => inputformat,:outputformat => outputformat }
      parse_response(response.body)
    end
returns all possible conversions and options