Fasteners printed bolts and nuts version1.scad

version 1.5 scad has nut and bolt files included and includes offsets to make print at zero on z. also are included angle change of the threading for nut and bolt. bolt needs different angle than nut to prevent overhangs. there still is a glitch in how open scad combines the triangle mesh, and the only way to fix it causes some issues when viewing the stl file but the errors are too fine to print, so i guess it still comes out ok.

i also loaded an stl file of the combo nut and bolt. this is s