convert requestcache.py to use per-class logger
convert timeline.py to use per-class logger
convert util.py to use per-class logger
convert dispersy.py to use per-class logger
convert message.py to use per-class logger
convert database.py to use per-class logger
convert dispersydatabase.py to use per-class logger
convert tool/main.py to use per-class logger
convert tool/tracker.py to use per-class logger
convert tests/dispersytestclass.py to use per-class logger
convert tests/test_bootstrap.py to use per-class logger
convert tests/test_candidates.py to use per-class logger
convert tests/test_nat_detection.py to use per-class logger
convert tests/test_overlay.py to use per-class logger
convert tests/test_undo.py to use per-class logger
fix the problem of "No handlers could be found for logger 'Tribler.dispersy.community'"
convert discovery community to use per-class logger
remove logger.py
some cleanup