code: function Confluence(config) {
      if (!(this instanceof Confluence)) return new Confluence(config);
  
      if (!config) {
          throw new Error("Confluence module expects a config object.");
      }
      else if (!config.username || ! config.password) {
          throw new Error("Confluence module expects a config object with both a username and password.");
      }
      else if (!config.baseUrl) {
          throw new Error("Confluence module expects a config object with a baseUrl.");
      }
  
      this.config = config;
  
      this.config.apiPath = '/rest/api';
      this.config.extension = ''; // no extension by default
  
      if (this.config.version && this.config.version === 4) {
          this.config.apiPath = '/rest/prototype/latest';
          this.config.extension = '.json';
      }
  }
docs: Construct Confluence.
  
  @constructor
  @this {Confluence}
  @param {Object} config
  @param {string} config.username
  @param {string} config.password
  @param {string} config.baseUrl
  @param {number} config.version - Optional