Xcode 8.1 compatibility

[redbaron76]

Any chance to make it running on Xcode 8.x?
New Xcode asks to convert Swift language but doing so, it finds many errors and then can't build the project. Thanks

[rmelian2014]

@redbaron76 I had done the migration if you are interested can get it from my fork meanwhile my pull request is approved https://github.com/rmelian2014/iBeacon/tree/Swift3.1