RZUSBStick Zigbee Sniffer Killerbee Slim Friction Case

I designed this friction-fit case for the [AVR RZUSBstick](https://www.mouser.com/ProductDetail/Microchip-Technology-Atmel/ATAVRRZUSBSTICK?qs=txwRF2uft8wSedIxfUdhAA%3D%3D) to be as minimal as possible, but added the option to include a "killerbee" wasp emblem for those that flash the [killerbee firmware](https://github.com/riverloopsec/killerbee/tree/master/firmware).

Includes a plain case and one with a wasp emblem embedded, wasp credit to Alajaz with https://www.thingiverse.com/thing:869932