updated README.md
Merge remote-tracking branch 'upstream/master' into improved-timeouts
Imrpoved timeout behavior and docs

- Added support for float timeouts by setting timeout_ms
- Ceil float timeout
- Set nosignal: true by default
Ruby 1.8 fixes
refactor sanitize_timeouts!
Merge pull request #398 from local-ch/improved-timeouts

Improving timeout behavior and documentation