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* feature:Docstrings: Add docstrings for resource identifiers, attributes, references, and subresources. (`issue 239 <https://github.com/boto/boto3/pull/239>`__)
* feature:``S3``: Add ability to configure host addressing style when making requests to Amazon S3. (`botocore issue 673 <https://github.com/boto/botocore/pull/673>`__)
* bugfix:``IAM``: Fix model issue with attached groups, roles, and policies. (`issue 304 <https://github.com/boto/boto3/pull/304>`__)
* bugfix:``EC2.ServiceResource.create_key_pair``: Fix model issue where creating key pair does not have a ``key_material`` on ``KeyPair`` resource. (`issue 290 <https://github.com/boto/boto3/pull/290>`__)