code: function (options) {
      return qfs.listTree('.', function (filePath) {
        var file = path.basename(filePath)
        // Do not traverse into the node_modules directory
        if (file === 'node_modules' || file === '.git') {
          return null
        }
        // Collect all files "credits.md"
        if (file === 'credits.md.hbs') {
          return true
        }
        return false
      }).then(function (creditFiles) {
        return deep(creditFiles.map(function (creditFile) {
          console.log("Using credit file", creditFile)
          var input = _.merge({}, this, {
            __dirname: path.dirname(creditFile),
            __filename: creditFile
          })
          return qfs.read(creditFile).then(function (contents) {
            return options.customize.engine.compile(contents)(input)
          })
        }))
      })
    }
docs: Collect all credit-files concatenated them
  and as a list return them
  
  @returns {*}