Convert to Java 5 enhanced loops.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1429890 13f79535-47bb-0310-9956-ffa450edef68
Add missing '@Override' annotations.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1429891 13f79535-47bb-0310-9956-ffa450edef68