code: function Engines(engines, options) {
    this.options = options || {};
    this.cache = engines || {};
    this.AsyncHelpers = this.options.AsyncHelpers || AsyncHelpers;
    this.Helpers = this.options.Helpers || Helpers;
  }
docs: ```js
  var Engines = require('engine-cache');
  var engines = new Engines();
  ```
  
  @param {Object} `engines` Optionally pass an object of engines to initialize with.
  @api public