Add zip files as-sent to PCB Fab
Perhaps these should not technically be considered "source" files and
placed in git, but experience shows it's much easier to pull the zip
file for a speciifc revision than to try and recreate the *exact* set
of gerber files.

...particularly with KiCad, which requires much manual futzing to
create decent assembly drawings.

Signed-off-by: Charles Steinkuehler <charles@steinkuehler.net>
Beginning of V2.1 updates:
* Bump version numbers
* Update 2N7002 value to 2N7002K to avoid confusiong
* Make all pin-header footprint pad/drill sizes consistent
*   Fix resulting DRC errors
*   Cleanup a few DFM issues missed previously:
*     Tracks not centered between pads
*     Spread long runs of parallel tracks where possible
* Add P8/P9 label text to top side of PCB

Signed-off-by: Charles Steinkuehler <charles@steinkuehler.net>