code: function MemcachedStore(opt){
    this._options = opt || {};
    this.memcached = opt.client || MemcachedStore._createClient(opt);
  }
docs: @class
  
  @private
  
  @description
  
  Caching implementation that uses Redis as data storage.  If an existing
  client instance is not provided, this constructor will create one.  Utilizes
  the [memcached library](https://github.com/3rd-Eden/memcached).
  
  @param {Object} [options]
  @param {Object} [options.client] A memcached client instance
  @param {Object|String|Array} [options.connection] Memcached client constructor
  connection string parameter.
  @param {*} [options.*] Other options to pass to the Memcached client constructor.