[COLLECTIONS-372] Allow different input/output types for TransformingComparator.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1453516 13f79535-47bb-0310-9956-ffa450edef68
Fix typo.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1453519 13f79535-47bb-0310-9956-ffa450edef68