Enable new emmet by default, add toggle comment feature

src/vs/workbench/parts/emmet/electron-browser/emmet.contribution.ts

@@ -62,7 +62,7 @@ configurationRegistry.registerConfiguration({
 		},
 		'emmet.useNewEmmet': {
 			'type': 'boolean',
-			'default': false,
+			'default': true,
 			'description': nls.localize('useNewEmmet', 'Try out the new emmet modules (which will eventually replace the old single emmet library) for all emmet features.')
 		}
 	}

src/vs/workbench/parts/emmet/electron-browser/emmetActions.ts

@@ -249,7 +249,8 @@ export abstract class EmmetEditorAction extends EditorAction {
 		'editor.emmet.action.mergeLines': 'emmet.mergeLines',
 		'editor.emmet.action.selectPreviousItem': 'emmet.selectPrevItem',
 		'editor.emmet.action.selectNextItem': 'emmet.selectNextItem',
-		'editor.emmet.action.splitJoinTag': 'emmet.splitJoinTag'
+		'editor.emmet.action.splitJoinTag': 'emmet.splitJoinTag',
+		'editor.emmet.action.toggleComment': 'emmet.toggleComment'
 	};
 
 	protected emmetActionName: string;