Code review. Added TODOs, style changed on the fly

- Removed useless thread use. It would use N * sleep(1) instead of
  sleep(N), thus waking up thread unnecessarily
- Style changed for a more conventionnal ruby code
- TODO's added, grep them all in the next iteration
Merge pull request #16 from giglemad/master

Code review. Added TODOs, style changed on the fly