Fix couple of problems I found on windows platform:
- sendBreak resulted in "timeout value is negative" error
- WinAPI.SetCommBreak mistakenly called CloseHandle
- random "port not locked" caused by problem in JTermiosImpl.lock()
Merge pull request #20 from AriSuutariST/onewire-fixes

Fix couple of problems I found on windows platform (issues #18 & #19)