I don’t see anything regarding vendoring. What’s the current official tool for managing dependencies ?
There's no official tool (yet). The community seems to push dep as a future official tool though: https://github.com/golang/dep
Dep is very nice. We've been using Glide for more than a year, but it's incredibly buggy/flaky and has several ugly misbehaviours. Dep isn't finished, but it's already better than Glide, and we're transitioning over to it.