Relay power cord case

This is a case for the [Sparkfun Beefcake relay](https://www.sparkfun.com/products/13815). In addition to the two 3D printed parts, you will need:
* A cord that you want to splice into the relay. I used something like [this](https://www.mcmaster.com/71535k51) that I had lying around.
* [Sparkfun Beefcake Relay Kit](https://www.sparkfun.com/products/13815)
* Some sort of control wire. I used an old USB cable.
* Cord grips, I used [McMaster P/N: 74125K81](https://www.mcmaster.com/74125k81) - Q