OAK-301 : oak docu

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1646293 13f79535-47bb-0310-9956-ffa450edef68
OAK-2366: Cleanup org.apache.jackrabbit.oak.kernel package
move StringCache to cache

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1646294 13f79535-47bb-0310-9956-ffa450edef68
OAK-2366: Cleanup org.apache.jackrabbit.oak.kernel package
Make JsonFilter private inner class of JsonSerializer

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1646295 13f79535-47bb-0310-9956-ffa450edef68
OAK-2366: Cleanup org.apache.jackrabbit.oak.kernel package
move json related stuff to json package

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1646296 13f79535-47bb-0310-9956-ffa450edef68