Update ClassLoaderLeakPreventor.java

Update for jetty mbean problem
Improve logging of ThreadLocals
Merge branch 'master' of https://github.com/rapla/classloader-leak-prevention into jetty
Refactoring and bugfixing special treatment for Jetty JMX
Exceptions cause ClassLoader not to be collected
Allow customizing ThreadLocalProcessor
Improved java.net.Authenticator cleanup and workaround for https://issues.apache.org/jira/browse/CXF-5442
Improved workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=423255 that will handle cases where Jetty objects are null
Merge branch 'jetty'
Merge branch 'jetty'
[maven-release-plugin] prepare release classloader-leak-prevention-1.9.0
[maven-release-plugin] prepare for next development iteration
Version 1.9.0 released, updating README.md
Clear ThreadLocals after threads have been stopped
[maven-release-plugin] prepare release classloader-leak-prevention-1.9.1
[maven-release-plugin] prepare for next development iteration
Version 1.9.1 released, updating README.md
Make extra sure that ThreadLocal references are removed, even in the current Thread
[maven-release-plugin] prepare release classloader-leak-prevention-1.9.2
[maven-release-plugin] prepare for next development iteration