code: function (name, extension, engine) {
                  // add to storage
                  this[name] = engine.render || engine;
                  enginesByExtension[extension] = engine;
  
                  return this;
              }
docs: add bem engine
  @param {String} [name]
  @param {String} [extension]
  @param {Function|Object} engine
  @returns {Engines}