LUCENE-5447: StandardTokenizer should break at consecutive chars matching Word_Break = MidLetter, MidNum and/or MidNumLet (merged branch_4x r1569601)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_7@1569627 13f79535-47bb-0310-9956-ffa450edef68