code: function getUser (argv, next) {
    if (argv.user) return next()
  
    const conf = rc('npm')
    if (!conf) return next('no npm config found')
  
    const github = conf['init.author.github']
    if (!github) return next('no init.author.github set')
  
    const name = conf['init.author.name']
    if (!name) return next('no init.author.name set')
  
    argv.user = github
    argv.realName = name
    next()
  }
docs: get the current user if no user was specified (obj, fn) -> null