`StatusReceiver` thread is not a daemon

[ignormies]

At one point in time, StatusReceiver used to directly subclass Thread, and this line was used:

brainframe-python/brainframe/api/status_receiver.py

Line 34 in 6bfd3b7

 self.daemon = True 

When we switched to composition instead of inheritance, the Thread was accidentally not made a daemon:

brainframe-python/brainframe/api/status_receiver.py

Lines 36 to 37 in 6bfd3b7

 self._thread = Thread(name="StatusReceiverThread", 
                       target=self._run) 

[Tyler Compton]

Wow Bryce, I think you just about fixed this one!