BeagleBone Black and Replicape Box

This box for BeagleBone Black and Replicape is a bit taller to accommodate an extra stacking header between the BBB and the Replicape.

Unique(?) features include:
* Mount point for a 50mm blower, aimed to blow air between the BBB and Replicape to cool off any installed heat sinks for the stepper drivers. The mount was lifted from the extruder mount for the [Hypercube Evolution][1].
* Cut-out to allow a MicroSD extender to exit the case
* Cut-out to allow a 90 degree USB host extender to