various uptades, added .stl files (not my work, unpushed commits)
Merge branch 'master' of
https://github.com/Technocopia/ServoStock-hw.git

Conflicts:
	ServoStock/Axis/Parameters.scad
updates to hex bit adapter

finished defining all major features, need to go back in when servo horn
vitamin is created.  four screw holes connect the adapter to the horn,
which holds the hex bit. 
in other news, I miss fillets.  Fillets make everything smooth and
friendly.