Merge pull request #136 from ktekinay/master

Various additions (MacDiskUtil, Printer functions) and fixes
Merge pull request #62 from macoslib/master

Merge changes
Merge pull request #137 from ktekinay/master

AuthorizationShell changes
Merge pull request #63 from macoslib/master

Merge changes
Merge pull request #64 from ktekinay/macoslib-master

Merge changes