LazyDynaBean now uses DynaBeanPropertyMapDecorator to expose its values as map.

This decorator class allows exposing the map with the generic types
<String, Object> rather than <Object, Object>.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/beanutils/branches/java5@1536078 13f79535-47bb-0310-9956-ffa450edef68