commit changes for v 0.9.1:

commit changes for v 0.9.1:
- Fix bug where logging would stop if target program has terminated before input has been processed (e.g. if Alt-F4 was hit).
- Improve threading implementation of the main logwriter. Now exits cleanly and instantaneously when quitting.
- Use the 'logging' module to do the debug-level logging to console and to systemlog; improve debug message informativeness.