add eu-central-1 region
Merge pull request #385 from johannesnagl/patch-2

add eu-central-1 region to s3 definition file
Fixing a typo in some code on thew user guide FAQ page.
Updated Route 53 with the latest features.
Updated CloudFront with the latest features.
Added support for configuring push synchronization to the Cognito Sync client.
Updates to the CHANGELOG
2.7.3 release
Merge pull request #1 from aws/master

Update from original