Imports
- github.com/docker/distribution/context
- github.com/docker/distribution/registry/storage/driver
- github.com/docker/distribution/registry/storage/driver/factory
- github.com/Sirupsen/logrus
- github.com/docker/distribution/registry/storage/driver/base
- github.com/AdRoll/goamz/s3
- github.com/AdRoll/goamz/aws