Code re-style commit, bug fix
Fixed full-throttle Subscriber bug.

due to a misplaced while(true) while learning about monitors,
when the message queue was empty; we would spin at high-speed,
not stopping for no one.

Conceptual Bug was about monitors. They drop the lock. It's cool.

Fixed by removing outer while-true loop, leaving only inner peek-loop.
Added first-draft of MessageListenerGUI

It doesn't work yet. Having issues with Swing threads. I can't
figure out of the thread is sticking around, or exiting when it
shouldn't.
Merge on top of Audrey and the world.
Merge branch 'master' of https://github.com/CMU-Robotics-Club/RoboBuggy