Change notes: How to set up a Unix system for Node apps that write to S3

Some Drummer users are trying to get drummerCms to work on their servers, so they can publish to a custom domain. To do so you have to set up your system so that Node apps can read and write to S3 via Amazon's API. #

I've been telling people to follow Amazons directions. I just reviewed them and they seem pretty straightforward. But they could be a tiny bit easier, so I wrote these instructions. #

Having done all that, the app that tried to write to S3 should now be able to do it without error. #