Update to Guzzle 4
Update Formatter to support Guzzle 4
Update EwayClient for Guzzle 4
Remove 5.3 support
PSR2 fixes [skip ci]
Update structure for PSR-4
Update docblock [ci skip]
Update CHANGELOG for 3.0 release [skip ci]
Update README for 3.0 release [ci skip]
Update EwayClientTest to support newer guzzle-services changes
Merge pull request #5 from bluedogtraining/guzzle_4

Guzzle 4