mattt/Euler — pull request #6 by otaviocc (2014-08-25 07:13:08+00:00)
Title: Adds vector norm (aka length) and angle between vectors

```
let p = [1.0, 3.0, 5.0]
let q = [0.0, 1.0, 0.0]

let normaP = ‖p // 5.91607978309962
let val = p ⦡ q // 1.03898822984733
```