Habrakeyboard is a native iOS keyboard extension that is suitable for using in pair with Habrahabr app. The main scenario of usage is writing comments to articles.
Full description of project is available here (RUS)
Run VPHabrakeyboardApp.xcodeproj on device or similuator. After that go to Device Settings -> General -> Keyboard -> Keyboards -> Add New Keyboard -> Choose "Хабр". If you need integrate this extension to your app, create new target for Custom Keyboard and copy contents of VPHabrakeyboard/Keyboard directory to your project.
Keyboard settings (available in global device settings) can't be saved. No any changes can be applied. It's iOS8 bug.