Vertical is same as horizontal

### Checklist
* I'm using **version** 0.3.3
* My **browser** is: Chrome 57.0.2987.98 (64-bit)

### Description

Vertical orientation is the same as horizontal.

### How can we reproduce this bug?

Set the option : orientation: "v"

### What did you expect to happen?

Vertical range !

### What happened instead?

Horizontal range !
