allows json input to be converted to csv and sent as a response
npm install json2csv-response
* This script is amalgamation of 2 existing npm modules, that both do only 1 thing well each, and i needed functionality of both
* It's extending the response object to allows res.csv (similar to res.json or res.send) that outputs csv file
* It's also including headers for any subsequent element in json array, even if they are not contained in 1st json element