2017-01-05, Version 6.9.4 'Boron' (LTS)

This is a special release that contains 0 commits. While promoting
additional platforms for v6.9.3 after the release, the tarballs on the
release server were overwritten and now have different shasums. In
order to remove any ambiguity around the release we have opted to do a
semver patch release with no changes.