OAK-301: Document Oak
OAK-301: Document Oak

Replace DocumentMK with DocumentNodeStore. The former refers to a class, which is now deprecated.
List pairs of tested Oak / MongoDB versions
Update default RGC behaviour on RDB

git-svn-id: 67138be12999c61558c3dd34328380c8e4523e73@1818034 13f79535-47bb-0310-9956-ffa450edef68

davidegiannella/jackrabbit-oak,davidegiannella/jackrabbit-oak,davidegiannella/jackrabbit-oak,davidegiannella/jackrabbit-oak,davidegiannella/jackrabbit-oak