JRuby 9000 is now 9.0.0.0 (official version number for release).

Early last week we switched to the normal semver version number for JRuby 9000, 9.0.0.0. As a result, our snapshots have switched to that version numbering for the tarballs and the directory contained.

We will manually make the "9000" tarball match the old filename and path for now, but this patch should get rbenv users on the right version.