Try to infer the edition from the path

For a `contentApiQuery` defined for a specific path, we always use `Edition.defaultEdition`. We should be at least trying to infer what the edition might be.

So we try, and if we don't know, we use the default.


@stephanfowler @ironsidevsquincy 
This means before this PR, requests out to anything other than `/uk`, `/us` and '/au' had the `defaultEdition` in its query. The `defaultEdition` being `Edition.UK`.