Add more hints in the SSH key prompt error message
Run tests prior to packaging / publishing
Major version should reflect config file format

We now only throw a version mismatch in case the major version numbers
mismatch. This allows us to preserve configuration files more often, and
only restore them when something has gone horribly wrong and they need
to be regenerated (or when we actually introduce new required
attributes).
Add utility tools after gosu

This lets us cache gosu installation in Docker
Escalate command failures in packaging
Release: 7.8.2
Merge pull request #97 from Scalr/release-7.8.2

Release 7.8.2