Delegate methods

It got a bit inspired by http://khanlou.com/2016/09/swifty-delegates/ that @onmyway133 shared in the previous discussion. So I wanted to run some stuff by you when building delegate methods.

I would propose that we start moving towards what the article is describing.
To give you a concrete example from the Spots Swift 3 migration.
I'd like to change the public API for the `SpotsDelegate` method that gets invoked whenever someone taps on an item.
## Before

``` swift
func spotDidSelectItem(_ spot: Spotable, item: Item)
```
## After

``` swift
func didSelect(item: Item, in spot: Spotable)
```

I think that reads much nicer.

What do you guys think? @hyperoslo/ios