Fix formatting, warnings.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1633227 13f79535-47bb-0310-9956-ffa450edef68
Add missing svn:keywords

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1633228 13f79535-47bb-0310-9956-ffa450edef68
Add new concrete MultiValuedMap implementation.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1633229 13f79535-47bb-0310-9956-ffa450edef68