Swift 3 Conversion

[ryangittings]

Hey!

Swift 3 conversion would be awesome :)

[nrbrook]

I've not installed the XCode beta yet, I'll do it when I get chance, or feel free to submit a pull request, cheers!

[nrbrook]

Have a go with 16bf2b2 and let me know how you get on!

[NateFuller]

@nrbrook I'm guessing this can be closed? Thanks for your work on this, by the way 👍