code: function options (userOpts) {
    if (appLoaded && typeof userOpts === 'undefined') {
      return appOptions
    }
    userOpts = typeof userOpts === 'object' ? userOpts : {}
    appOptions = Object.assign({}, defaults, userOpts)
    appOptions.paths = Object.assign({}, defaults.paths, userOpts.paths)
    appLoaded = true
  
    return appOptions
  }
docs: Merge user options with defaults
  @param {object} userOpts
  @return {object}