code: function Eggtart(username, password, opts) {
    opts = opts || {};
  
    this.version = opts.version || 'v1';
    this.wait = opts.wait || 1000; // mandatory wait to avoid forced throttling
    this.url = util.format('https://%s:%s@api.delicious.com/%s/',
      username,
      password,
      this.version);
  
    this._init();
  }
docs: class Eggtart
  
  @param {String} username: Delicious account username
  @param {String} password: Delicious account password
  @param {Object} opts: optional
  - version: API version, default: v1