remove obsolete TODO wrt handling of hidden items, which has entirely been moved to the Tree implementations.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1572467 13f79535-47bb-0310-9956-ffa450edef68
add issue reference to OAK-1476 wrt hardcoded security provider impl.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1572471 13f79535-47bb-0310-9956-ffa450edef68
add issue reference to OAK-1476 wrt hardcoded security provider impl

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1572474 13f79535-47bb-0310-9956-ffa450edef68
OAK-1267: Failure in ObservationRefreshTest
ignore test again until this is sorted out

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1572475 13f79535-47bb-0310-9956-ffa450edef68