Tar/untar now correctly supports symlinks.

Repository on our domain name would allow us to control redirection
better.

maven.glassfish.org being down makes this issue a higher priority.
This is a permanent change --- even if m.g.o is back we won't be
going back.

This reverts commit acef92c4.
2.2.2 has http://jira.codehaus.org/browse/MRELEASE-724 and it prevents
me from running a release.

Bundle slf4j binding to the war.
See the comment in war/pom.xml for detailed discussion.

This is fundamentally a "damned if I do, damned if I don't" situation,
but given that JENKINS-12334 is a fatal error, and the downside of
bundling the binding jar is "multiple binding" warning, it seems like
the lesser evil is to bundle it and risk some warnings.