Emlid Navio Case

The original design of the Navio 2 case by @mcancion is great but didn't leave enough space to get the SD card out on the Raspberry Pi 3 (which has no spring mechanism) and the GPS connector on the top needed more room. Also I thought my older Navio+ could benefit from the same design, so remixed another top for that.

All Navio models can share the same base, so long as they are used with a Raspberry Pi 2 and 3. The extra space for the SD slot on Raspberry Pi 2 is not a problem, in fact bette