Simple NSToolbar Wire (in Swift)

Code that demonstrates how to wire up an NSToolbar/NSToolbarItem in Swift and NSStoryboards.

Question answered at Stackoverflow. More info at: http://stackoverflow.com/questions/24219441/how-to-use-nstoolbar-in-xcode-6-and-storyboard/24810534?noredirect=1#comment38523066_24810534