Fixed enum binding support (issue #49)

test/com/google/gwt/inject/client/binding/ConstantBindingTest.java

 /*
  * Copyright 2008 Google Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
  * use this file except in compliance with the License. You may obtain a copy of
  * the License at
  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
@@ skipping 49 matching lines @@
   public void testShort() {
     assertEquals(FruitGinModule.LEAVES, injector.getLeaves());
   }
 
   public void testString() {
     assertEquals(FruitGinModule.NAME, injector.getName());
   }
 
   public void testEnum() {
     assertEquals(FruitGinModule.COLOR, injector.getColor());
+  }
+
+  public void testInnerEnum() {
+    assertEquals(FruitGinModule.FAMILY, injector.getFamily());
   }
 
   public String getModuleName() {
     return "com.google.gwt.inject.InjectTest";
   }
 }