code: function createErroringStub(err) {
    return function() {
      this.args.forEach(function(argSet) {
        setTimeout(argSet[1].bind(null, err));
      });
      this.yields(err);
    };
  }
docs: Returns a method that calls all callbacks given to the method it is attached
  to with the given error.
  
  <pre>
  myClientStub.someMethod.errorOnCall = createErroringStub(error);
  
  // elsewhere
  
  myClientStub.someMethod.errorOnCall();
  </pre>
  
  @param {?} object anything
  @return {Function}