1. Set python dependency paths in Application Bundle adhering the Homebrew convention of installing them in prefix/libexec
2. Add appdmg configuration to produce an os x disk image for FreeCAD application distribution
3. Added a Tools convenience script to produce an archive name from a serialized Version.h file using the convention FreeCAD_{Major Version Number}.{Minor Version Number}-{Git Revision Count}.{Git Short SHA}-{OS}-{Arch}
