Port to Swift

HI Immenge,

I have had a look at your code - very nice work. I have made a port into Swift of it - you can find it on my fork: https://github.com/joachimboggild/WatchSpringboard-Swift

If you like, you could link to it in your readme, in case anybody else is interested in a Swift version.

I have not ported the PrivateApi utility - did not know how to do that in Swift :-)
