A few model updates.
Updated CHANGELOG and fixed the failing test due to updating the signature.
Added support for the new, recursive DynamoDB types, by simplifying the DynamoDB serialization process.
Deprecating and updating parts of the DynamoDB namespace that do not support the new document model.
Preparing for the 2.7.0 release.
Fixed a test to use PHP 5.3 array syntax. *Sigh*
Fixed another instance of PHP 5.4 array syntax. Thanks Travis.
Fixed another test. :-(
Fixed one more array syntax issue.
Update README badges.
Tweaked version constraints
Merge pull request #361 from GrahamCampbell/patch-2

Tweaked Version Constraints
Reducing the number of signed sigv4 headers.

This commit is similar to https://github.com/aws/aws-sdk-php/pull/364.
Merge pull request #365 from aws/v2_signature_headers

Reducing the number of signed sigv4 headers (for v2)
Prepping the 2.7.1 release
Updated UPGRADING guide with a brief blurb about version 2.7
Automating github API releases for v2
Removing regions list from doc output, and instead using rande.html
Fixed #369. Corrects the HashUtils::hexToBin function for PHP 5.3 users.
Fixed #373. Corrects a date formatting issue in CognitoSyncClient::updateRecords.