Simple javascript library to perform signed requests to access secured AWS resources with the credentials provided by Amazon Cognito Federated identities.
Signature Version 4 Signing Process: http://docs.aws.amazon.com/general/latest/gr/signature-version-4.html
Cognito Federated Identities: http://docs.aws.amazon.com/cognito/latest/developerguide/what-is-amazon-cognito.html