Pixelblaze case

This is a small box to put a [Pixelblaze](https://electromage.com/pixelblaze) WiFi LED controller in, to protect the bare circuit board from damage. It has openings for the LED terminal block and USB port, and optionally access to the pads on the bottom.

I appear to have a "v3.4" board, and the 3D model I found for v3.6 seems to have the mounting holes in a different place. I'm not sure if it's compatible. I've included the Fusion 360 model for ease of modification.

I based this on JPMakesStuff's [wall mount](https://www.thingiverse.com/thing:4569299) for the bottom, and built a box around it.