Merge pull request #62 from macoslib/master

Merge changes
Merge pull request #63 from macoslib/master

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

Merge changes
NSToolbarCustomItem relied on an extension present only in Additional Modules

- Added release notes.
Correct capitalization of last fix
Merge pull request #138 from ktekinay/master

NSToolbarCustomItem relied on an extension present only in Additional Modules