Statusbar app sample for Mac (Yosemite or later)

1. Add LSUIElement to Info.plist and set it YES
2. Create NSStatusItem in AppDelegate
3. Configure images and an action to NSStatusItem.button
4. Show NSPopover from the button action

See header files of NSStatusItem and NSStatusBarButton for details. They don't show up in official documents for some reason.

For OS X Marvericks https://github.com/shpakovski/Popup

MIT