Setup ember article route based on config from MW

DO NOT merge just yet

This has to be deployed first:
https://github.com/Wikia/app/pull/5569

then this can be deployed

and at the end:
https://github.com/Wikia/wikia-vcl/pull/325

Should be simple and easy :)

articlePath will always have a '/' appended to it? Seems like if that changes for some reason in the API, these routes will also break and we currently don't have an integration test in place to warn us of this. I'd err on the side of caution and check for '/' and append if missing.