Added Motor control service. Can drive motors for any number of satellites, so long as you have that many motors/com ports. Slug Motor is the protocol defined by Sander and I, a simplified version the ICOM CI-V format. This was shown to work when we tried it out in lab. Will test if this app can run the motors tomorrow.

Motor control logic is defined in its own JS file, located in lib/motors. It is a self-executing function that returns an object with the functions necessary to operate the motors. The returned functions must follow the convention shown in the code, and in the README.