Tons of more stuff

+ Test code (not functional, currently disabled) for trying to count faces, by user-facing camera.
+ Reset head to middle tilt at beginning of test run.
+ Added setting exoskel LED to white (not pulsing) at test run start.
+ Added to UI gauge showing exoskel battery level (with convenient low/OK colouring).
+ Added NSLog to the web-based logging code flow (to make life a bit easier sometimes).
+ Cleaned up some clunkiness with the core logging code.