OAK-1708 - extend DocumentNodeStoreService to support RDBPersistence

Fixing issue when Mongo is not there as pointed by Julian

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1599503 13f79535-47bb-0310-9956-ffa450edef68
OAK-1695 - Solr indexer documentation

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1599507 13f79535-47bb-0310-9956-ffa450edef68
OAK-1695 - Solr indexer documentation, fixed oak-doc parent pom version

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1599512 13f79535-47bb-0310-9956-ffa450edef68
OAK-1266 - improve documentation and error handling

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1599529 13f79535-47bb-0310-9956-ffa450edef68