I try to run the latest version of feed-registry (commit: 8ff0a1d) and the latest release of transitland-datastore (commit: 48c6ad0ce746cabdd6fbd569e6153092bfcad7e5).
When I add a feed, I can upload a file, but than I have a error due to the fact that feed_versions is a has_many (https://github.com/transitland/feed-registry/blob/master/app/feed/model.js#L10), and transitland-datastore returns a null, it's incompatible.
It would be great to add to the documentation which version of transitland-datastore is compatible with feed-registry.