Calcula dirección del huracán de costas usando azimuth

Hack the planet

![screen shot 2014-07-01 at 2 10 16 pm](https://cloud.githubusercontent.com/assets/705860/3447964/d5a496be-0153-11e4-9ef3-b8eed4027651.png)

---

![screen shot 2014-07-01 at 2 12 31 pm](https://cloud.githubusercontent.com/assets/705860/3447967/d9a808ea-0153-11e4-845e-55d04dc03ae3.png)

---

Fixes #80