TypeOracle to allow access to the list of annotations on an element.

This brings HasAnnotations up to spec with java.lang.reflect.AnnotatedElement.

http://gwt-code-reviews.appspot.com/1352805/show

Review by: tobyr@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9712 8db76d5a-ed1c-0410-87a9-c151d255dfc7