Made JS enum declarations compatible with google closure

Original change by: https://github.com/alexames

Change-Id: Ib65bd02156d1c3637ed278a8334a2307caacaa44

tests/namespace_test/namespace_test1_generated.js

@@ -13,12 +13,21 @@ var NamespaceA = NamespaceA || {};
 NamespaceA.NamespaceB = NamespaceA.NamespaceB || {};
 
 /**
- * @enum
+ * @enum {number}
  */
 NamespaceA.NamespaceB.EnumInNestedNS = {
-  A: 0, 0: 'A',
-  B: 1, 1: 'B',
-  C: 2, 2: 'C'
+  A: 0,
+  B: 1,
+  C: 2
+};
+
+/**
+ * @enum {string}
+ */
+NamespaceA.NamespaceB.EnumInNestedNSName = {
+  0: 'A',
+  1: 'B',
+  2: 'C'
 };
 
 /**

tests/namespace_test/namespace_test1_generated.ts

@@ -1,7 +1,7 @@
 // automatically generated by the FlatBuffers compiler, do not modify
 
 /**
- * @enum
+ * @enum {number}
  */
 export namespace NamespaceA.NamespaceB{
 export enum EnumInNestedNS{