code: function(weekday, fnRender) {
          for (var p=0;p<this.pages.length;++p) {
              var cal = this.pages[p];
              cal.addWeekdayRenderer(weekday, fnRender);
          }
      }
docs: Adds a weekday to the render stack. The function reference passed to this method will be executed
  when a date cell matches the weekday passed to this method.
  @method addWeekdayRenderer
  @param {Number} weekday  The weekday (1-7) to associate with this renderer. 1=Sunday, 2=Monday etc.
  @param {Function} fnRender The function executed to render cells that match the render rules for this renderer.