What is the scope of this crate?

[emberian]

Should it consist only of Cocoa.framework or should/can it bind to all of the OS X SDK?

[pcwalton]

I think it should probably be limited to Cocoa.framework, but I don't feel strongly either way.

[conradev]

It would be great to pull OS X specific stuff out into a feature, because Cocoa.framework and AppKit.framework are not included on iOS and a lot of this library is applicable on both iOS and OS X.