Add promises to AWS methids

promisifyAWS.js

const cloudformation =  new AWS.CloudFormation();
const describeStacks = promisifyAWS(cloudformation, 'describeStacks');

// Issue with AWS Code structure.
// Not bening fixed, but this should work for the methods I have seen.
// https://github.com/aws/aws-sdk-js/issues/278
function promisifyAWS(service, method) {

    return function(params) {
        return new Promise(function (resolve, reject) {
            service[method](params, function (err, data) {
                if (err) {
                    reject(err);
                    return;
                }
                resolve(data);
            });
        });
    }

}

Not sure if this is the best code in the world, but it works and I can stop thinking about it.