Update for 2.1 release.
Update for 2.1 release.
Fix configuration for maven changes plugin update.
Update release notes for 2.1
Remove unused custom javadoc tags.
Fix javadoc warnings.
Javadoc.
Specify logback scope in log4j-perf.
Add benchmarks for obtaining stack trace class array.
Update LoaderUtil.getCurrentStackTrace() to prefer SecurityManager.

  - Based on benchmarks, it's faster to use SecurityManager when
  getting the entire stack trace than to use sun.reflect.Reflection
Move ReflectionUtil feature from log4j-slf4j-impl.
Speed up log4j-slf4j-impl LoggerContext lookup.
Remove use of custom javadoc tag.
Update tests to use ILC.
Refactor SerializationTestUtils into Hamcrest matchers.