Raspberry Pi 7" Display Stand

Simple Display Stand for Rasberry Pi 7" Display

Similar to: http://www.thingiverse.com/thing:1021025

But:

* OpenSCAD.
* Allow the usb power port to be at the bottom (normal display orientation).
* Provide mounting holes on the foot.
* Variable thickness display supports to accomodate various M3 screw lengths.
* Added webbing for better strength.
* Adjustable foot size for better free-standing stability.