It appears that download issues with the ruby buildpack still aren't fixed. Really you guys should be hosting these on your own S3 account as literally every time I've tried to use Flynn or Deis they are unusable because both utilities use heroku hosted buildpacks and they're consistently broken (slugbuilder related I think?).
Yep. It was because slugbuilder didn't lock buildpacks to a known working version when you ran a `docker build`. It always pulled master, which may or may not work. We fixed that up, and we're in sync with Heroku's buildpack version that's running in prod now: https://github.com/deis/slugbuilder/blob/deis/builder/instal...
