update changelog, add remainder 6.6.X changlog entries
 Merge branch 'update/changelog' into 'master'

Update/Changelog

Update the changelog to add the remaining 6.6.X entries
Restore old travis.yml

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Merge branch 'master' of github.com:gitlabhq/gitlabhq
Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ce