Adding multiple lines to PNChartLabel

* Multiple lines of text in UILabel

@@ -20,6 +20,7 @@
         self.textAlignment             = NSTextAlignmentCenter;
         self.userInteractionEnabled    = YES;
         self.adjustsFontSizeToFitWidth = YES;
+        self.numberOfLines             = 0;
         /* if you want to see ... in large labels un-comment this line
         self.minimumScaleFactor        = 0.8;
         */