[Feature request] Support Lambda Node.js 4.32

[agarstang]

Implement support for latest Lambda Node.js 4.32 release and the callback method functionality that is replacing the context object.

https://aws.amazon.com/blogs/compute/node-js-4-3-2-runtime-now-available-on-lambda/

[nmaves]

Would you accept a PR on this?

[agarstang]

I would be interested to see how you would do it. I looked into it and could implement most of the functionality however I was unsure on intricacies of the "callbackWaitsForEmptyEventLoop" setting.

[agarstang]

#76 👍

[Tim-B]

Pull request #76 has been merged and included in the release I just published.