[LOG4J2-733] Update to latest Jackson jars from the 2.4.1.X line.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1612725 13f79535-47bb-0310-9956-ffa450edef68
Update extending manual to reference correct file names.

  - Also added some more markup to make thing prettier.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1612728 13f79535-47bb-0310-9956-ffa450edef68
Add changelog entry for LOG4J2-731.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1612729 13f79535-47bb-0310-9956-ffa450edef68
Add security check for accessing BundleWiring class through adapt().

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1612730 13f79535-47bb-0310-9956-ffa450edef68