LUCENE-5431: add FSLockFactory.toString() and fix FilterDirectory to override getLockID(); also change FSDirectory.toString() to use class.getSimpleName()

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1564304 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5341: fix RAMDirectory to override getLockID()

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1564412 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5694: update gitignore

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1564419 13f79535-47bb-0310-9956-ffa450edef68