get rid of bucket/directory delete - not allowed for IA
add IA specific headers for file
get rid of versions from IA
Merge remote-tracking branch 'upstream/master' into internet_archive
missed one
fix tests, found a few differences with S3
fix 1.8.7 error, oops
fix internet archive use of headers, remove acls
Merge pull request #1634 from PRX/internet_archive

[Internet Archive] handle IA specific headers