OAK-527: permissions (wip, store must be read-only)

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1451275 13f79535-47bb-0310-9956-ffa450edef68
OAK-527: permissions (wip)

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1451277 13f79535-47bb-0310-9956-ffa450edef68
add solr modules to README

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1451283 13f79535-47bb-0310-9956-ffa450edef68