Updated the CloudFront client to support the 2014-05-31 API
Added support for the CloudSearchDomain client.

The CloudSearchDomain client can be used to search and upload documents to you CloudSearch domains.
Merge branch 'cloudsearchdomain' into release-2.6.9
Merge branch 'cloudfront-update' into release-2.6.9
Updated CHANGELOG for release 2.6.9
Merge branch 'release-2.6.9'