Validation error message improvements.
Error if latest alias is used when no releases are found on director.

Because of release name mismatches, manifests with an empty version
were being uploaded to the director and causing validation errors
during deployment.
When a task fails tell the user how to get more detail.
Merge pull request #153 from mmb/validator_errors

Validation error message improvements.
Merge pull request #154 from mmb/latest_missing

Error if latest alias is used when no releases are found on director.
Merge pull request #155 from mmb/error_debug

When a task fails tell the user how to get more detail.
Removed extraneous bundle exec in bootstrap AWS causing build failures