Add nameChanged handler

The `nameChanged` handler leads to the expected behavior if the `name` attribute changes, in that it will attempt to load the `value` corresponding to the `localStorage` cache with the key `name`.

core-localstorage.html

@@ -72,16 +72,15 @@
      */
     autoSaveDisabled: false,
 
-    attached: function() {
-      // wait for bindings are all setup
-      this.async('load');
-    },
-
     valueChanged: function() {
       if (this.loaded && !this.autoSaveDisabled) {
         this.save();
       }
     },
+
+    nameChanged: function() {
+      this.load();
+    },
 
     load: function() {
       var v = localStorage.getItem(this.name);