Added support to Aws::Support::Client for attachments.
Added support to Aws::IAM::Client for credential reports.
Updated API reference documentation for Aws::CloudSearch::Client.
Removed dangling example tags from Aws::CloudSearchDomain::Client API documentation.
Added deprecation warnings to Aws::SVC.new
Removed usage of deprecated Aws::SVC.new methods from specs.
Added a client helper method to Service.
Added unit test to InstanceProfileCredentials for another possible failure case.
Improved the error message when unable to connect to target endpoint.

Prefixing the SocketError message with the hostname of the
endpoint that was unable to be reached/resolved.

Fixes #70