Deployment tooling/Cabal/2016-06-13

Random updates and questions

 * Tilerator is moving (slowly but surely)
 * graphoid likely to follow
 * Scap MW canary deploy:
 * Question about prerequisites: https://phabricator.wikimedia.org/T136839 ?
 * scap stages
 * unexpected behavior when
 * should go through each stage with a particular `batch_size`