Compact and Secure Orange Pi Zero Case

I just got a new [Orange Pi Zero](http://www.orangepi.org/orangepizero/), the $7 ARM microcomputer. So I had to create a case for it, of course.

Based on popular demand, I added case for version with the optional interface board, which adds additional ports.

The case is designed to be quite sturdy, holds together with 2.9 mm screws.

There are the following files:
* Case for Orange Pi Zero only
* `OPiZ_Case_bottom.stl` - bottom part of the case
* `OPiZ_Case_top_ant.stl` - top part, variant with antenna hole only
* `OPiZ_Case_top_ant_vent.stl` - top part, variant with antenna and ventilation holes
* `OPiZ_Case_top_full.stl` - top part, variant without any holes
* `OPiZ_Case_top_vent.stl` - top part, variant with ventilation holes only
* Case for Orange Pi Zero + Interface Board
* `OPiZ_Case_ifb_bottom.stl` - bottom part of the case
* `OPiZ_Case_ifb_top_ant.stl` - top part, variant with antenna hole
* `OPiZ_Case_ifb_top_full.stl` - top part, variant without any