v0.12.0

• API Change: S3Client supports an extra_args kwarg now to pass extra args down to boto3 functions; this enables Requester Pays bucket access and bucket encryption. (Issues #254, #180; PR #307)
• Speed up glob! (Issue #274, PR #304)
• Ability to list buckets/containers a user has access to. (Issue #48, PR #307)
• Remove overly specific status check and assert in production code on remove. (Issue #212, PR #307)
• Update docs, including accessing public buckets. (Issue #271, PR #307)