Call to extend() in index for controller

UncleCheese, can you add an extend to the top of the index of Calendar_Controller so the redirects can be overruled? (I'm using a customised calendar which I want to redirect to $this->redirect($this->Link('month')); instead of $this->redirect($this->Link('show/month'));)
Merge pull request #50 from marijnkampf/patch-1

Call to extend() in index for controller