drush migrate-manifest not found I'm trying to migrate a D7 site to D8 following this tut: http://www.metaltoad.com/blog/migrating-taxonomy-drupal-7-to-drupal-8

When I run 

drush migrate-manifest manifest.yml --legacy-db-url=mysql://{dbuser}:{dbpass}@localhost/{dbname} 

I get the error: 

The drush command 'migrate-manifest' could not be found.

I'm using drush version 8.0-dev. Installed via composer. I also tried version 7.* and got the same message plus "Drush 7.0.0 does not support Drupal 8." What gives?
Now this has been moved to Migrate Manifest module. You can enable this module and use drush migrate-manifest command.