Preparing release.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@1637035 13f79535-47bb-0310-9956-ffa450edef68
Better docs.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@1637038 13f79535-47bb-0310-9956-ffa450edef68