Classic Perlin Noise generator (Swift w/ example)

This code was an excerise to wrap my head around the math behind popular noise algorithms. The classic Perlin noise generator should be working fine. Simplex is still a work in progress. The playgrounds are just for tinkering. Check out the Xcode project for a working example written in Swift 2.

Code / references used:

• http://eastfarthing.com/blog/2015-04-21-noise/
• https://github.com/lachlanhurst/perlin-swift
• https://github.com/czgarrett/perlin-ios