Adding qcr plus making tag opts work

Fixes https://github.com/modcloth/bob/issues/28 

Supersedes https://github.com/modcloth/bob/pull/29

Do not merge until:
- [ ] https://github.com/modcloth/queued-command-runner/pull/1 has been merged
- [ ] the sha in `Godeps.json` for queued-command-runner has been updated