Imports
- github.com/docker/libtrust
- github.com/docker/distribution/registry/auth/token
- github.com/docker/distribution/context
- github.com/docker/distribution/registry/auth
- github.com/gorilla/mux
- github.com/docker/distribution/registry/api/errcode
- github.com/sirupsen/logrus
- github.com/docker/distribution/registry/auth/htpasswd