Export main artboards only
Hi @mathieudutour! 

Thank you for this amazing plugin. It is very helpful. Is there a way it could export the main Artboards panel and exclude styles and symbols?

In my case, I want to export Errata page artboards only.

![screenshot 2017-01-24 13 39 14](https://cloud.githubusercontent.com/assets/12257565/22263735/0cb35972-e23b-11e6-93d7-9c36bfe56cd6.png)


Thanks again!