Imports
- github.com/pkg/errors
- github.com/golang/dep/internal/gps/pkgtree
- github.com/sdboyer/constext
- github.com/nightlyone/lockfile
- github.com/Masterminds/vcs
- github.com/golang/dep/internal/gps/paths
- github.com/golang/dep/internal/fs
- github.com/armon/go-radix
- github.com/Masterminds/semver