OAK-659: Move purge logic for transient changes below the NodeBuilder interface
clarify usages of base instead of base()

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1558838 13f79535-47bb-0310-9956-ffa450edef68
OAK-1215 Relative property paths don't work in XPath search expressions (improved documentation, related small bugfix)

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1558839 13f79535-47bb-0310-9956-ffa450edef68