add licenses to extractors


git-svn-id: https://svn.apache.org/repos/asf/any23/trunk@1448870 13f79535-47bb-0310-9956-ffa450edef68
ANY23-2 : Add HReviewAggregate vocabulary and extractor


git-svn-id: https://svn.apache.org/repos/asf/any23/trunk@1448871 13f79535-47bb-0310-9956-ffa450edef68