Pull Request for Third-Party-Tools subdirectory

After reading something from the forums, I propose that we create a subdirectory for tools that integrate with third party services (eBay, Amazon, etc.). With the Beta release coming up, it's not surprising if this will not be surprising that this will not have a high priority, but having it on here would give it enough visibility for it to get some more collaborators when we get some more eyes on the project.