add default constructor that uses the default (delegating) proxyFactory

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/proxy/branches/version-2.0-work@967276 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/stub/src/main/java/org/apache/commons/proxy2/stub/AnnotationFactory.java b/stub/src/main/java/org/apache/commons/proxy2/stub/AnnotationFactory.java
index fe87620..ab24dde 100644
--- a/stub/src/main/java/org/apache/commons/proxy2/stub/AnnotationFactory.java
+++ b/stub/src/main/java/org/apache/commons/proxy2/stub/AnnotationFactory.java
@@ -51,6 +51,13 @@
 
     /**
      * Create a new AnnotationFactory instance.
+     */
+    public AnnotationFactory() {
+        this(ProxyUtils.proxyFactory());
+    }
+
+    /**
+     * Create a new AnnotationFactory instance.
      * @param proxyFactory
      */
     public AnnotationFactory(ProxyFactory proxyFactory) {