Fixed file size calculation for Filesystems that do not implement SizeCalculator
Update S3 docs. Using AwsS3 and S3Client with new AWS SDK.
Merge pull request #247 from eluceo/master

FIX file size calculation for Filesystems that dont implement SizeCalculator
Merge pull request #251 from undernewmanagement/patch-1

Update S3 docs. Using AwsS3 and S3Client with new AWS SDK.
Fix stream_wrapper_unregister error issue

This should fix issue #256
Fix readme typo
Merge pull request #258 from allanbrault/patch-1

Fix readme typo
AwsS3 adapter: fixed rename
Merge pull request #260 from teohhanhui/patch-s3-rename

AwsS3 adapter: fixed rename