Added support for the associatePublicIpAddress param to the EC2 client
Updated an exception string in the DynamoDB client
Fixes issue with SNS mobile push operations containing Attributes param. Fixes the way the SDK handles maps in AWS query.
Updated the SWF client to use SignatureV4
Added an SNS client-level test for attribute serialization
Merge pull request #139 from jeremeamia/bugfix-query-maps

Fixes AWS query map serialization and affected SNS mobile push features.
Fixed STS AssumeRoleWithWebIdentity operation so that request is not signed
Updated changelog for next release
Added an iterators guide to the SDK user guide
Fixing some comment formatting so API doc generation uses bulleted lists.
Adding missing setClient() call in DownloadSyncBuilder docs
Version bump for 2.4.4
Handle missing / invalid POST data in MessageValidator::fromRawPostData, in way that is much easier to catch / handle.
Added AWS GovCloud support to the CloudFormation client.
Added support for replication groups to the Amazon ElastiCache client
2.4.5 release
Ensuring that signable querystring parameters are sorted
Merge pull request #144 from aws/s3sigfix

Ensuring that signable querystring parameters are sorted
Make AmazonDb session handler implement native SessionHandlerInterface for >= 5.4
PHP_VERSION_ID was introduced in 5.2.7, so safe to use here.