This directory holds vendored dependencies, managed via git subtrees. All management commands should be run from the top level of the repository. The blessed build procedure for the binaries (encoded in their Makefiles) makes use of this directory; normal development will use whichever version(s) are in your normal GOPATH.
git subtree add --prefix _vendor/src/github.com/foo/bar [email protected]:foo/bar master --squash
git subtree pull --prefix _vendor/src/github.com/foo/bar [email protected]:foo/bar master --squash