The fetching process listens to it's own schema
The fetching process listens to it's own schema

Now `_addSourceListeners` will get called with `emitter` as the
`Source.schema` from the fetching process. This is also kind of silly
because it goes through ChildProcess unnecessarily, but it seems clean
enough.

TID-Lab/aggie,TID-Lab/aggie,TID-Lab/aggie