Object file release updates

I've modded the release packages for the Cartesian bot and the Mk2 polymer extruder to cater for the new quickfit interface, and some minor revisions. The packages are available on SourceForge. Mods as follows:

Cartesian Bot 1.0.2, new STL's:
Z-toothed-pulley-rim.stl
Z-opto-flag.stl
Y-motor-coupling.stl
X-PCB-bracket.stl
X-carriage.STL
Extruder-quickfit-latch.STL
Extruder-quickfit-dock.STL
Bearing-insert-360-run.stl
Diagonal-tie-bracket.stl
Bearing-insert-180-Z.stl
Bearing-insert-180-X.stl

Thermoplast Extruder 1.0.1, new STL's:
quickfit-clamp.stl