Assumes any url with s3 in it is an s3 bucket

[gehan]

Currently if an origin domain contains s3 in it anywhere then it assumes it's an s3 bucket and changes the url to ${bucketName}.s3.amazonaws.com

https://github.com/serverless-components/aws-cloudfront/blob/master/lib/getOriginConfig.js#L18

There should be a more in-depth check for this - at the last adding some dots in there like .s3. or something like that.

I'm actually trying to use an s3 redirect bucket like this http://{bucketName}.s3-website-eu-west-1.amazonaws.com so it's causing an issues as the redirect only works from s3-website-eu-west-1 urls not s3.amazonaws.com so had to fork and alter this.

[gehan]

I did a PR for this - #19