OAK-2058: Hard-coded write concern

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1620905 13f79535-47bb-0310-9956-ffa450edef68
OAK-301: Document Oak
Remove obsolete information

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1620911 13f79535-47bb-0310-9956-ffa450edef68