Added IPv6 validation to Validator, also fixed a bug in IPv4 validation.

https://issues.apache.org/jira/browse/VALIDATOR-307


git-svn-id: https://svn.apache.org/repos/asf/commons/proper/validator/trunk@1648274 13f79535-47bb-0310-9956-ffa450edef68
Small fixup for my last commit.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/validator/trunk@1648275 13f79535-47bb-0310-9956-ffa450edef68