ADDED DXFs FOR LISA

CHANGED THE STYLE OF THE HUB BOTTOM.  I KEPT BREAKING THE POST SO I MADE THE POST REMOVABLE.
ENLARGED THE SCREW THREADS ON THE HUB BOTTOM.
ADDED DXFs FOR GUS SO PEOPLE CAN MAKE THEIR OWN BOARDS.
Update wally segmentize.py
Update simpson segmentize.py

Fixed a accidental *2 problem
Update simpson segmentize.py

ADDED G92 E0 TO THE BEGINNING TO KEEP FILAMENT FROM SPEWING OUT.
INCREASED THE DIAMETER OF THE HUB SCREW TO MAKE THE FIT BETTER.
FIXED BOM TO INCLUDE HUB SCREW
ADDED A NEW 20mm PULLEY TO GUS.  IT SHOULD BE MUCH EASIER TO PRINT AND DEAL WITH.
FIXED SOME CODE IN LISA'S SEGMENTIZE
Update simpson segmentize.py

Fixed shoulder_offset to 37.5
Fix two minor Wally segmentize goofs:
interpolate() was doing integer divides
getABC() was using a constant value for coord

Signed-off-by: Charles Steinkuehler <charles@steinkuehler.net>
Merge pull request #8 from cdsteinkuehler/Wally.segment.fixes

Fix two minor Wally segmentize goofs
ADDED A FILAMENT DRIVE AND MOUNTS FOR WALLY, LISA, AND GUS.
Merge branch 'master' of https://github.com/NicholasSeward/ConceptFORGE
I AM TRYING OUT A FEW MODIFICATION ON THE MOTOR ARM.
MADE SEGMENTIZE MUCH BETTER.  YOU JUST INPUT A FEW MACHINE COORDINATES WHERE THE EXTRUDER IS TOUCHING AND THE PARAMETERS GET OPTIMIZED.
Updated the motor arm for gus to be easier to tighten a spool and easier to screw in the guitar tuners.
Added filament drive to gus bom
Update BOM.csv

Made the screws that hold the limit switch longer to get a more positive hold.