Simplify _webSocketThreadKeepAlive() and add logging
Remove self._ws_thread.join() from _webSocketThreadKeepAlive() - no longer seems necessary
Reduce main sleep time to 200ms to improve shutdown time
Add missing evtThreadEnded.clear() at end of loop
Remove unnecessary safeSleep() from common.py
Add logging callback to Pushbullet class and remove common imports
Pass log method on Pushbullet instance creation
Merge pull request #16 from elbowz/push_server_connection_thread_improvments

Push server connection thread improvments