Handling S3 - 307 Status code

When the bucket is just created and the DNS on amazon isn't synched fully, it will send you a redirect (307).
In these cases no error should be thrown. This commit fixes that.

For more information see:
- <https://github.com/LearnBoost/knox/issues/66>
- <http://docs.aws.amazon.com/AmazonS3/latest/dev/Redirects.html>