code: function(digit) {
  			if(typeof digit === "undefined") {
  				digit = this.digit;
  			}
  			else {
  				this.digit = digit;
  			}
  
  			if(this.digit != this.lastDigit) {
  				var $delete = this.$el.find('.'+this.classes.before).removeClass(this.classes.before);
  
  				this.$el.find('.'+this.classes.active).removeClass(this.classes.active)
  													  .addClass(this.classes.before);
  
  				this.appendListItem(this.classes.active, this.digit);
  
  				$delete.remove();
  
  				this.lastDigit = this.digit;
  			}	
  		}
docs: Select the digit in the list
  
  @param  int  A digit 0-9