Closure styling fixes for 1.1 work

gulpfile.js

@@ -499,7 +499,11 @@ gulp.task('zip:mdl', function() {
     .pipe(gulp.dest('dist'));
 });
 
-// Returns the list of children directories inside the given directory.
+/**
+ * Returns the list of children directories inside the given directory.
+ * @param {string} dir the parent directory
+ * @return {Array<string>} [description]
+ */
 function getSubDirectories(dir) {
   return fs.readdirSync(dir)
     .filter(function(file) {

src/layout/layout.js

@@ -423,6 +423,9 @@
    */
   function MaterialLayoutTab(tab, tabs, panels, layout) {
 
+    /**
+     * Auxiliary method to programmatically select a tab in the UI.
+     */
     function selectTab() {
       var href = tab.href.split('#')[1];
       var panel = layout.content_.querySelector('#' + href);