the JNLP versioned resource protocol so that it can download jardiffs
instead of whole new jar files when a resource bundle is updated.
Unversioned http downloads (which we'll probably continue to use for the
dynamically generated island bundles) are currently not working.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@2739 542714f4-19e9-0310-aa3c-eee0fc999fb1
Michael Bayne