Doc update.
Added support for Cognito developer identities.
Renamed a release rake task.
Removed the use of a deprecated interface from the integration tests.
Bumped version to v2.0.1
Added next release section to the changelog.
The release task that uploads gems to GH now correctly upload the preview release gems.
Moved the release task that creates a new changelog section into its own task.
Merge branch 'master' into ec2_status_watchers