message: middleware hook accepts a promise, oh good
diff: @@ -14,14 +14,15 @@ module.exports = {
  } catch (err) {
  project.ui.writeWarnLine(`Unable to load your seed models (looking for ${seedFile})`);
  }
  - makeServer(seedModels).then(server => {
  - app.use('/cardstack', server.callback());
  - });
  // Without this node 7 swallows stack traces within the native
  // promises I'm using.
  process.on('warning', (warning) => {
  process.stderr.write(warning.stack);
  });
  +
  + return makeServer(seedModels).then(server => {
  + app.use('/cardstack', server.callback());
  + });
  }
  };
  