code: function load (dir, name) {
    // Read config JSON.
    var path = dir + '/' + name + '.json'
    var json
    try {
      json = '' + fs.readFileSync(path)
    } catch (error) {
      if (this.isDebug) {
        console.error('No configuration found in "' + path + '".', error)
      }
      return
    }
  
    // Replace tokens like $HOST and ${PORT-8080} with environment variables.
    json = json.replace(/\$(\w+)/g, function (match, key) {
      return pe[key] || ''
    }).replace(/\$\{(\w+)(-[^\}]*)?\}/g, function (match, key, value) {
      return pe[key] || value.substr(1)
    })
  
    // Parse and decorate.
    try {
      var config = JSON.parse(json)
      decorate(this, config)
    } catch (error) {
      return console.error('Invalid JSON in "' + path + '".', json, error)
    }
  }
docs: Load a configuration file from the /config directory, and decorate the
  module exports with its values.
  
  @param  {String} name  File name, excluding ".json"