Adds P1 parting tool holder block

Changes to be committed:
	new file:   modelsFreeCAD/block-parting-p1.fcstd
Merge remote-tracking branch 'origin/master' into partingHolder
addspartingholdermodel

Adds FreeCAD and step models for a P1 parting holder
Merge pull request #10 from burdickjp/partingHolder

Adds P1 parting tool holder block