code: function() {
  		var me = this;
  		var callbacks = me._options.callbacks;
  
  		var beforeFooter = callbacks.beforeFooter.apply(me, arguments);
  		var footer = callbacks.footer.apply(me, arguments);
  		var afterFooter = callbacks.afterFooter.apply(me, arguments);
  
  		var lines = [];
  		lines = pushOrConcat(lines, splitNewlines(beforeFooter));
  		lines = pushOrConcat(lines, splitNewlines(footer));
  		lines = pushOrConcat(lines, splitNewlines(afterFooter));
  
  		return lines;
  	}
docs: Get the footer and beforeFooter and afterFooter lines Args are: (tooltipItem, data)