0.13      2013-01-21 13:05:20 Europe/Paris

0.12      2013-01-17 17:32:50 Europe/Paris

0.11      2013-01-17 16:01:36 Europe/Paris

0.10      2013-01-17 12:43:09 Europe/Paris
  * first implementation
  * non-blocking mode
  * fibonacci, linear mode