moved changes that may break existing configurations to a more prominent position at the top of the change list. This does not follow our convention of 'more recent changes at the top' but I think these changes warrant an exception.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1519323 13f79535-47bb-0310-9956-ffa450edef68