lib/utils/log/fileLog.js/fileLog
const fileLog = function(...args) {
  // TODO BRN: This does not guarentee order, is not multi process safe,
  // TODO BRN: and is not guarenteed to complete before exit.
  fs.appendFileSync(path.join(process.cwd(), 'sls.log'), `${_.join(args)}\n`);
};