Fix formatting and variable names.

Author: jasongrout

packages/widgets/src/menu.ts

@@ -1143,9 +1143,9 @@ namespace Menu {
     renderItem(data: IRenderData): VirtualElement {
       let className = this.createItemClass(data);
       let dataset = this.createItemDataset(data);
-      let attr = this.createItemARIA(data);
+      let aria = this.createItemARIA(data);
       return (
-        h.li({ className, dataset, ...attr },
+        h.li({ className, dataset, ...aria },
           this.renderIcon(data),
           this.renderLabel(data),
           this.renderShortcut(data),

packages/widgets/src/menubar.ts

@@ -43,7 +43,6 @@ import {
  */
 export
 class MenuBar extends Widget {
-
   /**
    * Construct a new menu bar.
    *

packages/widgets/src/tabpanel.ts

@@ -261,7 +261,6 @@ class TabPanel extends Widget {
     if (widget !== this.currentWidget) {
       widget.hide();
     }
-
     this.stackedPanel.insertWidget(index, widget);
     this.tabBar.insertTab(index, widget.title);