Add support for S3 Object for lambdas

[phstc]

nodejs8.10 + ZipFile isn't supported, in order to use nodejs8.10, we need to upload the lambda as a S3 object (create bucket, upload lambda, enable encryption all that stuff).

2018-05-31 15:12:21 UTC CREATE_FAILED AWS::Lambda::Function lambda ZipFile can only be used when Runtime is set to either of nodejs, nodejs4.3, nodejs6.10, python2.7, python3.6.

Would be nice to have a helper in stax for that.

Also, maybe a folder samples/lambda-s3 or a wiki entry Upload lambda to S3 with a code sample.