Improvements for the zwave rename node entry (#296)

* Improvements for the zwave rename node entry

* Linter fix

panels/zwave/ha-panel-zwave.html

@@ -331,6 +331,8 @@ Polymer({
   },
 
   selectedNodeChanged: function (selectedNode) {
+    this.newNodeNameInput = '';
+
     if (selectedNode === -1) return;
     this.selectedConfigParameter = -1;
     this.selectedConfigParameterValue = -1;
@@ -402,9 +404,7 @@ Polymer({
   computeGetNodeName: function (selectedNode) {
     if (this.selectedNode === -1 ||
       !this.nodes[selectedNode].entity_id) return -1;
-    var str = (this.nodes[selectedNode].entity_id);
-    var name = str.replace('zwave.', '');
-    return name;
+    return this.nodes[selectedNode].attributes.node_name;
   },
 
   computeNodeNameServiceData: function (newNodeNameInput) {