PCKeyboardHack is renamed to Seil starting at v10.8.0

![screen shot 2014-06-21 at 10 47 49 pm](https://cloud.githubusercontent.com/assets/62091/3350509/a01b891a-f9b7-11e3-8372-4c9be1d9289f.png)

merging these changes would also include changing the repository name to be `puppet-seil`