Research and implement a heater control method

[brandonrobertz]

We need to find a reliable and safe method for keeping the heat at the correct temperature. The canonical method is via PID. We'll need to implement something similar, either a PID library, or something similar like Kalman Filter. There are libraries for all of these things. We need to abstract them out into a celery process which gets kicked off via a microlab command. This ticket is for the groundwork on this.