Finalize update of release process document
After addressing #11 (closed), update the google document with the description for MacOS that describes in detail how to use the factory machines to build and package aevaSlicer: https://docs.google.com/document/d/174hK_0vtSVWtgog0-oovVhOCNymuGZHIsPEqY4PQZ4g/edit.
Edited by Jean-Christophe Fillion-Robin