Implement AmazonS3Client#listVersions(...) wrapper
Integer options passed to s3 now more pleasant.
Merge pull request #24 from sw1nn/integer-arguments

Integer arguments to s3 options map
Merge pull request #23 from sw1nn/list-versions

Implement AmazonS3Client#listVersions(...) wrapper
maybe-int around max-results
Add version-id handling to get-object-metadata
Add delete-version.
Merge pull request #27 from sw1nn/add-delete-version

Add delete-version.
Merge pull request #25 from sw1nn/list-versions-maybe-int

maybe-int around max-results in list-versions
Merge pull request #26 from sw1nn/metadata-has-version-id

Add version-id handling to get-object-metadata