Adding aspect ratio functions

[jezreelbarbosa]

An easy way to set aspect ratio to views
Example of usage:

let movieBanner = UIImageView()
movieBanner.top(16).fillHorizontally(padding: 16).aspectRatio(16.0/9.0)

let poster = UIImageView()
poster.leading(16).fillVertically(padding: 16).aspectRatio(66%) // 2:3

[s4cha]

Hi @jezreelbarbosa,
You're adding a handy function, providing clean code using underlying apis and all that with unit tests.
What's more to ask ?! 💯
Thanks a lot for your patience,