Fixing issues #115 and #161

[stefanofornari]

Issue #, if available:
This PR covers issue #115 and #161

S3 compatible services like minio do not like AWS S3 virtual-style addressing, where the bucket name is considered part of the hostname (e.g. pippo -> pippo.s3.eu-central-1.amazonaws.com).
We therefore set the path-style addressing by default for s3x provider, while we also give the possibility to configure it via the s3.spi.force-path-style.

I took this opportunity to make some improvements to the readme about the different configuration parameters. Please have a look and let me know if you like it.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[markjschreiber]

@stefanofornari there is a version conflict in this PR. This may be due to the order in which I merged your other PR? Can you resolve the conflict and then we can get these changes into the next release.

[stefanofornari]

@stefanofornari there is a version conflict in this PR. This may be due to the order in which I merged your other PR? Can you resolve the conflict and then we can get these changes into the next release.

I should have done

[markjschreiber]

I like this PR but I am wondering if there is a way to only force path style for S3x URIs? Path style requests are being retired from S3. Could the default be to not force path style but to allow that to be configured?

https://docs.aws.amazon.com/AmazonS3/latest/userguide/VirtualHosting.html#path-style-access

[markjschreiber]

Please ignore my last comment. I missed that force path style isn't actually the default.