Merge branch 'release/1.1.0' into develop
Clarify messages
Listing on s3 works again
Implement CopyItems() to copy from Storage to Storage
s3 putting works again
Make prefix responsibility of Storage implementation (a la chroot)
Implement GCS getting
Implement gcs putting
Merge branch 'feature/gcs-rewrite' into develop
Use GCS’s S3-compatible API
Update README
Fix flag descriptions
Let's stick to SemVer
Merge branch 'release/2.0.0'