Nintastic long version

This is my remix of the beautiful Nintastic case for the Raspberry Pi. The main difference is that the whole case has been made longer in order to make it possible to close the front door when there's a memory card in the Pi.

Other small modifications include, for the bottom part:
- Several of the thinner parts made thicker and stronger (I broke mine off on the original)
- Additional horizontal struts added on the parts supporting the Pi
- The USB and audio ports enlarged to allow my RasPi to fit in properly (wouldn't quite fit in the original)
- The fake front panel buttons and LED replaced with movable buttons and a hole for a real LED

For the top part:
- Mesh cleanup to make the corner pieces integral parts of the wall
- Triangular supports next to the hole for the door to prevent warping
- Strengthening the hinges

And for the door:
- Increased size by 1% to make it fit tighter. The door was rattling loose on my print of the original Nintastic.