added credentials providers support
* Renamed `S3Resolver.settings` to `S3Resolver.defaults`;
* Removed `s3credentialsFile`;
* Removed `s3credentialsProvider`;
* Changed type of `s3credentials` to `AWSCredentialsProvider`;
* Added implicit convertions and a method to combine credentials providers;
Updated readme, added release notes
Setting version to 0.10.0
Setting version to 0.11.0-SNAPSHOT
Merge branch 'credential-providers'