Steal from the Github style guide!

GitHub have created their own guide here:

https://github.com/github/swift-style-guide

Good to see that we agree on quite a few syntax related points. However theirs is a lot more opinionated.

I am still trying to get my head around Swift structs and how widely to use them, notice that GitHub advise you to [prefer structs over classes](https://github.com/github/swift-style-guide?utm_content=buffer92806&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer#prefer-structs-over-classes).