PartDesign InvoluteGear/it

This tool allows you to create a gear.

Original file: https://github.com/FreeCAD/FreeCAD_sf_master/blob/master/src/Mod/PartDesign/InvoluteGearFeature.py

Recent forum link: http://forum.freecadweb.org/viewtopic.php?f=22&t=5977&p=47725&hilit=involutegear#p47725