Variabilize all URLs, configurable DATOMIC settings.
Improve BASH error handling. driver.sh and bootstrap.sh should...

1. verbosely log their actions.

2. fail on any error by default; curl seeing a 404 means borkage.
VBoxLinuxAdditions.run exits with non-zero code even when successful. Work around.
Nix dist-upgrade; Guest Additions are failing on it somehow.
Nix local fileserver model. Move editor_configs/ to its own repo.

Instead of serving editor binaries and editor configs from a local
fileserving daemon, move the binaries to S3, the configs to their own
repo, and fetch both accordingly.

Local server model still accommodated by setting SERVER var to some
scheme, IP and port. An easy way to power that...
cd your_srv_dir && python -m SimpleHTTPServer &
Make use of user vars in packer JSON.
Rename VM to boomstick.
Trivial.
Make better use of user vars in packer JSON to DRY things up.
Print a summary of elapsed times for each job.
driver.sh: Do S3 upload.
README.